The functions of the Secretary of State as “the appropriate Minister" (in pursuance of the definition in section 8(3)) are only transferred so far as they relate to water and sewerage undertakers (treated as statutory undertakers for the purposes of this Act by virtue of Schedule 25 to the Water Act 1989) except under section 16 where those functions are also transferred in relation to the bodies and trusts referred to in section 16(3). It is directed that, in relation to water and sewerage undertakers, these functions shall, in relation to land situated in the catchment areas of the rivers Dee, Wye and Severn be exercisable by the Assembly concurrently with the Secretary of State.