The executors absolutely must not do this. He should sell at the market price. He also has a duty to account to the beneficiaries under s25 Administration of Estates Act 1925 for ALL monies received during the administration (including rent).
I would be inclined to seek legal advice with a view to seeking directions from the Court under CPR Part 64 (which deals with disputes on estates). It is a complicated area though so you really should seek specialist advice.



