“Mr Harris and Mr Holland hereby agree and undertake to place, for open market sale, with Keystone Residential Agents (Ipswich properties) and Payne Associates (Coventry properties), as sales agent, all of the HB Residential Properties as soon as reasonably practicable and in such numbers and at such times as Keystone Residential Agents and Payne Associates shall advise (including those HP [sic] Residential Properties marked as Phase 1 in Schedule 4 which shall be placed for immediate sale) at such sale price as, following prior consultation with Mr Harris and Mr Holland, Keystone Residential Agents and Payne Associates shall advise ("Relevant Residential Sale Price").”