27mm, I was the Intercept Control Assistant on that! (main job making sure there were enough Polos on console) The controller was WO Gordon K*****, nice bloke, a bit scary and about 1,000 years old, eck, that means I've worked for BEags too!
Two years later standing on the Berlin wall flicking the Vs to the Vopos -
Ask the younger generation and they'll say 'What's the Cold War granddad?'
