Corporationmeans any of the following, namely— (a) the Birmingham Heartlands Development Corporation;
the 1980 Actmeans the Local Government, Planning and Land Act 1980;
the 1990 Actmeans the Town and Country Planning Act 1990;
the authoritymeans in relation to each Corporation the authority which, but for an order made under section 149 of the 1980 Act, would be the local planning authority, within the meaning of section 336(1) of the 1990 Act;