1. Where by virtue of paragraph (1) of Article 12 an object or structure ceases to be treated as part of a listed building—
(a)liabilities incurred before the coming into operation of that paragraph by reason of the object or structure being so treated cease to have effect; and
(b)a condition attached to a listed building consent ceases to have effect if, or to the extent that, it could not have been attached if that paragraph had been in force;
except for the purposes of criminal proceedings begun before the coming into operation of that paragraph.