A person whose interest in a defective dwelling is acquired by the purchasing authority in pursuance of Schedule 20 (repurchase) is entitled to be reimbursed by the purchasing authority the proper amount of—
expenses in respect of legal services provided in connection with the authority's acquisition, and
other expenses in connection with negotiating the terms of that acquisition,
being in each case expenses which are reasonably incurred by him after receipt of a notice under paragraph 3 of that Schedule (authority's notice of proposed terms of acquisition).
An agreement between a person and the purchasing authority is void in so far as it purports to oblige him to bear any part of the costs or expenses incurred by the authority in connection with the exercise by him of his rights under this Part.