There were also one or two 'blisters' dotted around but as far as I'm aware, these were never included in the 'lettered' series although I suppose as one was next to 'Q' Shed, maybe that was 'P' Shed?
When I was at RAE (1982-84) Q shed housed the RAE Gliding and Aero Clubs, and a couple of Sea Vixens which I think were for apprentice training. I remember the adjoininng blister which we used as a workshop and had a phone with which got the daily forecast from a Stonehenge number. I was very disappointed that the met person never answered with "Chief Druid speaking"! I don't remember the Blister having a formal name.