constituent councilmeans a riparian council or a non-riparian council;
contributing councilmeans a London council or a county council;
county councilmeans the council of the county of Essex or the council of the county of Hertfordshire;
local authoritymeans the council of a county, district or London borough, the Common Council of the City of London, the Thames Water Authority and an authority established under section 10 (joint arrangements for waste disposal functions) of the Local Government Act 1985 ”
London councilmeans a London borough council or the Common Council;
non-riparian councilmeans a London council other than the councils of the London boroughs of Enfield, Hackney, Haringey, Newham, Tower Hamlets and Waltham Forest;
riparian councilmeans a council specified in section 4(2) of this Act;