ESRO, wonderful ESRO
We've making a lot of ERSO visits at the moment and no doubt will be doing so for some time yet.
Recently, I mislaid a notebook with the references to some great finds from an earlier visit and had to spent several hours hunting it down, in order to return to the relevant documents. It was very worthwhile, a series of large scale plans of central Brighton, with a gazetteer listing the prooperty interessts within the featured area. All this drawn for railway companies.
Really valuable resources, as lots of detail and much produced before the first large-scale OS Map.
QDP 335/1 and /2
QDP 288/1 and /2
also worth a look, QDP 413