tony sayer wrote...

Why are they doing that? ITV 1 is much the same anywhere in that area
apart from the news I'd have thought Waltham is more your backyard
rather than the outpourings of Narwich....

Historical reasons I think. There are a couple of shallow valleys
running east west through the town so the slope you live on dictates
your transmitter but those on the heights; which is the majority, can
choose either, and it nearly always seems to be Anglia/BBC East

--
UnsteadyKen