The bunker at Ash was refurbished during the 1980s as part of UKADGE. The idea was to have 4 bunkers with the two SOCs each having a standby, Buchan/Boulmer and Neatishead/Ash. As it was Ash was only ever used as the UKADGE OCU then shut again and finally sold off.
There was never an AD radar at Ash during my time in the RAF from 1974 to 1999. We did get radar from feeds from the MATO/NATS radars when UKADGE came in and we went digital, but most were SSR only. Than was also when we started shutting Saxa and the other outer sites.
It was when NATO found that out they started making us put primary radars back in the western/northern approaches again.....