On a cold, miserable December day in the 70s, I visited Old Warden for the first time, specifically to take some photos of their 504K.
Whilst there, I spent a lot of time looking around and chatting with the staff. At one point, I was having a mug of tea with one of the engineers who was working on G-ACSS. The main spar was on some trestles and I can't remember the details, but we were either sitting on it, resting against it or placed our cups on it!
An occasion I always remember when seeing a picture of the Comet.