Fished wallers haven many years ago. I used to like it there. Plenty of silvers with bonus tench and bream, as well as a pike. Its very open and exposed, even on a calm day it could get windy. No idea on the other waters though
Got the Ouse had cuckmere there which have some good fishing, met a guy a few years ago that fished the former regularly and he showed me some pics of some cracking fish of all sorts of species. Some good beach fishing all along that part of the coast through the warmer months as well by all accounts.