" I believe the current British Research Concils mandate that experimental data is kept."
I'd like to think all research organizations have some sort of archiving and retention policy on the experimental data they collect.
"Damn good point. There is no point in having the raw data if you don't have the calibrations."
Exactly. I was gobsmacked to see a NASA NIAC presentation (IIRC) that said upgraded calibration targets on weather satellites had made significant changes to the interpretation of climate change data, but I can't recall if it was for better or worse.
IOW the readings you thought you were reading were not what you thought.
Which is kind of important. I'll also note with regard to land weather stations you see the "heat island" effect as what was a site in the middle of a field is now a site in the middle of an industrial park. Again, have you allowed for this?