Don't forget the R4 bunkers - used as regional HQs as the delegation of duties to SOCs rendered their planned AD role obsolete.
Did my FC training in the bunker at Bawdsey and tours in the prerefurbishment bunkers at Boulmer and Buchan before doing the IUKADGE OCU at Ash and then a tour at the refurbished R3 at Neatishead. Then I had a short tour in the WWII bunker at Bentley Priory in the very brief existence of SOC UK before a tour in the bunker at HW at the UKCAOC.
Thinking about it, I spent about over half my RAF career as a troglodyte.