This site was totally trashed but a few bits worth looking at...The only real redeeming feature was the view.....stunning. Nabbed this info on it.. This P.O Lab first came about around 1937. Some of its first work was related to developing cooling systems for telephone exchanges. It was a highly sensitive operation in its early years. Following a number of thefts, the 'White House' - the curved building - gained a night watchman. There was also an on site fire station which seems to have been later used as a vehicle maintenance area. It operated in conjunction with the Castleton station by 1945, and mid-war it was used to relay VHF Television signals- this was one of the first stations to be experimenting with this. By 1958 it was working in conjunction with a station in Slough, and they were working on Tropospheric tests (no idea). The final experiment was for 120MBPS Data links with Castleton again – after which it closed down in 1975. Ultimately this means that Backwell had a hell of a lot to do with early TV broadcast. There is even a reference to it being involved with the first overseas TV broadcast. Looking at some of the remaining equipment, I personally believe the site was still in use for some sort of British Telecom work in the early 1980’s – maybe for training or storage etc. It was sold in 1993. Credit for the above to 'Dead Format' ... https://www.youtube.com/watch?v=DZD-CtoFnUI