In this Part of this Act—

• “functions” includes powers and duties; and

• “relevant authority” means—

  1. a

     in England F1 ., the Secretary of State, F2a water authority, a county council, . . . F3, a district council, a London borough council, the Common Council of the City of London, the Sub-Treasurer of the Inner Temple and the Under Treasurer of the Middle Temple F4and, for the purposes of sections 91 to 93 of this Act, a sewerage undertaker; and

  2. aa

     F5in Wales, the Secretary of State, a county council or a county borough council and, for the purposes of sections 91 to 93 of this Act, a sewerage undertaker; and

  3. b

     F6in Scotland—

     1. i

        as respects sections 91 and 92, a council constituted under section 2 of the M1Local Government etc. (Scotland) Act 1994; and

     2. ii

        as respects this Part other than those sections, the Secretary of State, SEPA or a council constituted under section 2 of the Local Government etc. (Scotland) Act 1994.