If you do find any pyro related stuff that you don`t want for yourself, we would be very interested and grateful if it could collect it for our museum!
PM me when you decide to visit, I will try and get down there!
I will certainly PM you when I go down and would be more than happy to point out what went where, I believe the footprint of the original site will be clearly visible, when I visited the place around 5 years ago I re-traced the position of the R & D block where I spent the first 5 years of my career (and possibly the happiest), the remains of the floor paint were still to be seen, albeit faintly in mottled red - the significance to me was that I painted it as a young lad, a menial job for the lab boy!
There will be nothing left, the site was absolutely cleared. Some stuff was buried but lifted up later. If you had gone down there 2 or 3 years after it shut you would not have believed your eyes, very old labelled tubes all over the place and thousands of them. If ebay had been about you would have made a fortune. The ceiling of the engineers block was looted by scroats looking for copper, they had stored old tubes and stuff up there and these fell through onto the floor below, there were so many that even I got bored looking at them.
On the subject of museum contributions, I do have some stuff which will be of possible interest and will certainly be making contact to discuss contributions and loans to this very worthy enterprise.