"Opportunities will be sought to maximise the provision of permanent affordable housing in any proposal which includes housing. The Council will encourage residential developments involving Registered Social Landlords, acting either on their own or in conjunction with the private sector, that will meet the needs of buyers or renters on low to middle incomes who are unable to gain access to the housing market. Affordable housing will be expected on sites: (a) capable of providing 10 or more units, or (b) of 0.3 hectares or more Such schemes will be subject to negotiation as to the appropriate amount of permanent affordable housing to be included. The Council expects that over the Plan period 40% of all new units will be permanent affordable housing. Provision will be made to ensure that housing remains permanently affordable for successive occupants. Where necessary, the Council will use its powers to restrict the occupation of property to people falling within particular categories of need. The long term management implications of the scheme should be taken into account and designed into a proposal from its inception. In exceptional circumstances, the Council may consider a financial contribution to its Affordable Housing Fund as an alternative to on site provision on the basis set out in para 8.41 below."
"In exceptional cases, where the Council accepts off site provision of affordable housing, a Section 106 Agreement would be sought whereby a financial contribution to the Council's Affordable Housing Fund would enable equivalent provision to be made elsewhere [I interpose, that is of course section 106 of the Town and Country Planning Act]. The amount involved should take account of the value for money approach and other financial constraints under which RSLs operate and would be the subject of negotiation. The amount would be applied to the same ratio of private:affordable housing as would have been provided on site, eg if one:three of all units on site would have been affordable, then the formula should be applied to one third of the on site total. All contributions made to the ring fenced Affordable Housing Fund are re used as Local Authority Social Housing Grant (LASHG) funding, for purposes under theHousing Act 1985 , either for new affordable housing or for bringing existing private properties back into use as affordable housing in pursuance of housing and planning objectives. As an alternative to financial contributions it may be possible to 'match' a site for off site provision, where it is in the ownership or control of the same developer involved in the affordable housing site. In such cases, an agreement would need to be drawn up to ensure that the affordable housing was built before, or in conjunction with, the market housing element. Information on the Fund is available from the Council."
"Affordable housing provision will be expected in relation to sheltered housing schemes, equivalent to that stated elsewhere in the policy, but the Council would not expect a proportion of the scheme to be taken over or managed by a RSL. The affordable housing could be in the form of either: (a) a separate construction on the same site, or (b) an allocation on a separate 'matched' site as outlined in the preceding paragraph, or (c) a contribution to the Affordable Housing Fund as described in the preceding paragraph, using floor space as well as the number of units as a guide."
"In line with Circ 6/98 and PPG33 [of course that would now be Planning Policy Statement 3], the Council's policy has a strong presumption in favour of on site provision of affordable housing. In exceptional circumstances, the following alternatives may be considered..."
"a financial contribution to the Council's Affordable Housing Fund. This Fund, established in 1993, is ring fenced to the provision of affordable housing in the Borough. It is used on schemes agreed between the Department of Social Services and Housing, the Department of Environmental Protection and Customer Services, and the Department of Environment, Planning and Review, in accordance with Housing Corporation guidance. The level of contribution is calculated according to the method described in section 17 below."
"Where, in exceptional circumstances, a financial contribution is acceptable as an alternative to on site provision, a standard method is used."
"The UDP adopted in 1996 set out the formula for calculating financial contributions as 'the market value of the property less 75% TCI' [TCI is an engaging acronym for total cost index]. In most cases where financial contributions have been accepted, 100% TCI has in practice been found appropriate. The formula was not carried forward into the UDP First Review, partly because of on going discussions about the adoption of a London wide formula, and partly because it was considered that a formula is better set out in supplementary planning guidance, which is more responsive to changing circumstances than a long term plan. 17.3. The formula to be applied now is: 'The value (unencumbered) on the open market of units of the same size and in the same location, less any Social Housing Grant granted to that scheme.' 17.4. The formula is applied in such a way that a similar ratio of market:affordable units would be achieved as if they were provided on site. Thus on a scheme of 10 units involving 40% on site affordable housing there would be 6 private and 4 affordable housing units; but if the affordable housing were provided elsewhere, there would be 10 units on site and 6.4 affordable units elsewhere. The formula would therefore be applied to 6.4 units."
"In any particular case involving the interplay of a policy indicated in a development plan and other material considerations, there may be more than one acceptable interpretation in planning terms of a policy indicated by the plan, and more than one 'correct' application of it when set against the other considerations. A planning decision maker's approach to policy will only be interfered with by the court if it goes beyond the range of reasonable meanings that can be given to the language used: see R v Derbyshire County Council, ex parte Woods [1997] JPL 958, CA, per Brooke LJ at page 967 968: "
'if there is a dispute about the meaning of the words included in a policy document which a planning authority is bound to take into account, it is of course for the court to determine as a matter of law what the words are capable of meaning. If the decision maker attaches a meaning to the words they are not properly capable of bearing, then it will have made an error of law, and it will have failed properly to understand the policy (see Horsham DC v Secretary of State for the Environment[1992] 1 PLR 81 , per Nolan LJ at 88). If there is room for dispute about the breadth of the meaning the words may properly bear, then there may in particular cases be material considerations of law which will deprive a word of one of its possible shades of meaning in that case as a matter of law. This, in my judgment, is the underlying principle of law which Auld J was putting into words in his judgment in Northavon DC v Secretary of State for the Environment [1993] JPL 761. When discussing the meaning of the expression 'institutions standing in extensive grounds', the report reads at 763: '
"Main Issues 3. I consider the main issues in this case to be: a) the effect the development would have on the living conditions of neighbouring residential occupiers; b) whether satisfactory arrangements have been made towards meeting the need for affordable housing in the area ... 7. Policy HSG 1 sets out an overall housing target. Policy HSG5 gives general encouragement to new residential provision in areas of mixed use. Policy HSG 6 seeks opportunities to maximise the provision of permanent affordable housing in housing proposals. Affordable housing will be expected on sites capable of providing 10 or more units or of 0.3 hectares or more, with the appropriate amount of affordable housing to be subject to negotiation. It is indicated that in exceptional circumstance the Council may consider a financial contribution to its affordable housing fund as an alternative to on site provision. Policies HSG 7 and HSG 8 give requirements on mobility and wheelchair standards respectively. Policy HSG 11 indicates that, in considering the appropriate density and mix of dwelling sizes, regard will be given to the need to use land as intensively as is compatible with the protection of the quality, character and amenity of the area and the contribution to meeting housing need for all sections of that community. Factors are identified that will be taken into account, with an expectation that a reasonable number of small units will be provided. Policy HSG 12 deals with the particular implications of backland and infill development, including consideration of any significant loss of amenity space or material loss of privacy as a result of overlooking adjoining houses and/or their back gardens. Policy HSG 18 refers to standards that will normally be applied in considering residential proposals... 9. The Council in 2003 issued supplementary planning guidance on affordable housing. At the hearing it was agreed that this should form the basis for assessing the affordable housing arrangements for the proposal in conjunction with the development plan policies, and I accord it significant weight... Affordable housing 15. Provision for affordable housing in association with the development is expected under UDP policy HSG 6. There is no dispute in relation to the principle of providing a financial contribution in lieu of on site provision of affordable housing. This is allowed for under the policy, and was an approach supported by the previous Inspector. There is also agreement in relation to the methodology to be applied in calculating the appropriate contribution pursuant to the supplementary planning guidance (SPG). This deals with the equivalent proportion of units sought, dwelling sizes, and expectation regarding the availability of public subsidy towards affordable housing (Total Cost Indicator). 16. Dispute arises in relation to the open market value of units that should be used in the relevant formula so as to derive the difference between this and the relevant TCI, which is then applied as the factor in calculating the contribution. The appellant's original offer of£225,119 was based on research of asking prices of properties within the area. The Council is requesting a contribution of£1,268,960 cited two identified comparisons within the immediate vicinity of the site. The appellant subsequently increased the offer to£300,000 and this is incorporated as a planning obligation within the undertakings. The Council continues to seek its original sum, and therefore the difference between the parties remains considerable. 17. I regard a number of points as relevant in assessing these respective positions. In the SPG there is no definition of the term 'in the same location' as the basis for calculating open market value. The appellant's research was based on market details of 46 one and two bedroom properties centred on the TW12 postcode area, then used to derive average prices. These figures appear to be verified by the Land Registry data for TW12. In my opinion the geographical basis for this approach is reasonable, and the analysis relatively robust. The appellant fairly points out that the two original comparators used by the Council are of new high specification developments, and not necessarily indicative of wider market prices. The further examples brought by the Council to the hearing were limited and undocumented. 18. The SPG refers to the intention of the formula as being that a similar ratio of market:affordable housing would be achieved as if the units were provided on site. The Council argued at the hearing that only new build comparisons should be considered. However, the UDP refers to the affordable housing fund to which contributions are directed as being used either for new affordable housing or to bring existing private properties back into use as affordable housing in pursuance of housing and planning objectives. I have no reason to doubt that these objectives could be achieved with the types of property identified in the appellant's research. The formula refers to 'open market value of units'; it does not specify only new build. While there will clearly be a variation in the number of units that could potentially be achieved depending on location and other factors, I do not regard the calculation basis of the appellant's contribution as incompatible with the purposes of the off site formula. 19. As a further matter, both the London Plan and the UDP refer to details of affordable housing being agreed by negotiation. This reflects advice in Circular 06/98. Reference is also made in policy to a need for flexibility having regard to particular circumstances. There is some information before me regarding the viability of the proposal. The Council criticises this information for lacking full details of the individual premiums over market values payable to the existing owners of the site, identified at the hearing as totalling 26%. Nevertheless, the written brief of the Council's adviser on viability, while referring to a lower norm for such premiums, also states that the submitted appraisal calculations are not unreasonable. In identifying the premium as the factor preventing payment of the off site contribution sought by the Council, it suggests that the alternative would be the scheme not proceeding. I acknowledge that brownfield development is not unusual in the Borough, but in this case I accept the appellant's explanation of the relatively high premium based on the number of different owners involved in assembling the site. In this respect I take into account the intention of the London Plan that development should be encouraged rather than restrained, and the reference of 06/98 to the need to achieve a successful housing development. 20. Negotiations will lead to variable outcomes. However, having regard to the evidence before me, I consider that the affordable housing contribution that would be secured by way of the unilateral undertakings is reasonable and complies with the aims of the development plan in this respect."