Just to bump this back up again and to confirm the current contractors for addressing letters, can anyone confirm or deny the following?
Barkston Heath : VT Aerospace
Wattisham: Serco or VT Aerospace now?
Wyton: VT Aerospace
Middle Wallop: Serco
Warton: BAe Systems
Woodvale: VT Aerospace
Also any "inside info" (via PM if you so wish) as to who may be looking for controllers would be a bonus!