DE
Thames' studio complexes were for News (Euston) and Productions (Teddington) though weren't they? Not unusual to have separate centres for news and everything else.
ATV Elstree was a legacy of the fact that originally they held the London Weekend franchise (as well as the Midlands weekday). When they lost London Weekend to ... er ... London Weekend Television (!) they kept it, along with Broad Street. The IBA criticised ATV for not being regional enough and forced them to restructure if they kept the Midlands franchise. The restructure led to the formation of Central, the sale of Elstree to the BBC and the construction of Nottingham Lenton Lane. Central also built a small news studio centre in Abingdon, so split their transmissions into three sub regions.
ATV Elstree was a legacy of the fact that originally they held the London Weekend franchise (as well as the Midlands weekday). When they lost London Weekend to ... er ... London Weekend Television (!) they kept it, along with Broad Street. The IBA criticised ATV for not being regional enough and forced them to restructure if they kept the Midlands franchise. The restructure led to the formation of Central, the sale of Elstree to the BBC and the construction of Nottingham Lenton Lane. Central also built a small news studio centre in Abingdon, so split their transmissions into three sub regions.