“13. Increases of rent under assured periodic tenancies. (1) This section applies to – (a) a statutory periodic tenancy other than one which, by virtue of paragraph 11 or paragraph 12 in Part 1 of Schedule 1 to this Act, cannot for the time being be an assured tenancy; and (b) any other periodic tenancy which is an assured tenancy, other than one in relation to which there is a provision, for the time being binding on the tenant, under which the rent for a particular period of the tenancy will or may be greater than the rent for an earlier period.”
“ … that section excludes a tenancy where provision is made for an increase in rent, and this exclusion applies not simply as the judge thought to cases where the amount of the increase in the rent is set by the tenancy agreement, but also in cases where the tenancy agreement merely provides machinery for increasing the rent.”
“Changes in net rent (a) The net rent payable under this agreement will be reviewed in April every year, regardless of when the tenancy started. (b) We may increase or decrease the rent by giving you four weeks’ notice in writing. The notice will set out the proposed net rent and service charge.”
“Review of Rents During the first year after the grant of this Tenancy Longhurst Group may vary the rent once only by giving the tenant one calendar months’ notice in writing. The notice shall specify the rent proposed. Thereafter Longhurst Group may vary the rent by giving the tenant not less than one calendar months’ notice in writing. The notice shall specify the rent proposed. The rent shall not be increased within 52 weeks of the previous increase.”