19. In this Part—
“the 1992 Act”means the Local Government Finance Act 1992(1);
“billing authority”and “major precepting authority”have the same meanings as in the 1992 Act;
“central expenditure”means expenditure of the Residuary Body other than relevant expenditure;
“relevant authority”means an abolished authority any of whose property, rights or liabilities (or related functions) are transferred to the Residuary Body by a relevant instrument;
“relevant area”, in relation to a successor authority, means the area in relation to which that authority, on and after the abolition date, exercises functions which immediately before that date were exercisable by an abolished authority;
“relevant expenditure”means the expenditure of the Residuary Body in connection with all the property, rights or liabilities (or related functions) of abolished authorities transferred to it by relevant instruments; and
“successor authority”, in relation to a relevant authority, means—
where an order gives effect to a structural change, a principal council to which any functions of the relevant authority are transferred on the abolition date; and
where an order gives effect to a boundary change, a principal council whose area, on and after that date, includes an area which, before that date, is the whole or any part of the area of the relevant authority.