193.—(1) Nothing in section 191 shall prevent compensation being paid—

(a) in a case in which there has been a refusal of permission for the erection of a new structure substantially replacing a structure (other than an unauthorised structure) which has been demolished or destroyed by fire or otherwise than by an unlawful act of the owner or of the occupier with the agreement of the owner within the 2 years preceding the date of application for permission, or there has been imposed a condition in consequence of which the new structure may not be used for the purpose for which the demolished or destroyed structure was last used, or

(b) in a case in which there has been imposed a condition in consequence of which the new structure referred to in paragraph (a) or the front thereof, or the front of an existing structure (other than an unauthorised structure) which has been taken down in order to be re-erected or altered, is set back or forward.

(2) Every dispute and question as to whether a new structure would or does replace substantially within the meaning of subsection (1) a demolished or destroyed structure shall be referred to the Board for determination.