(1)A principal council must have regard to any guidance issued by the Welsh Ministers about the exercise of its functions in collaboration with another principal council.
(2)For the purposes of this section a principal council exercises a function in collaboration with another principal council if—
(a)it exercises a function of another principal council under an arrangement made under—
(i)section 101(1)(b) of the 1972 Act (discharge of functions by another local authority);
(ii)regulations made under section 19(1) of the 2000 Act (discharge of executive functions by another local authority);
(iii)regulations made under section 19(2) of the 2000 Act (discharge of non-executive functions by the executive of another local authority);
(b)it exercises the function jointly with another principal council under an arrangement made under section 101(5) of the 1972 Act (including by virtue of regulations made under section 20(1) of the 2000 Act (joint exercise of functions));
(c)it authorises another principal council to exercise the function under an order made under section 70 of the Deregulation and Contracting Out Act 1994 (c. 70);
(d)the function is exercised in relation to its principal area and the principal area of another principal council by a corporate joint committee;
(e)it exercises the function in collaboration with another principal council under any other enactment.