Posting this purely for enlightenment: I am not a member of HARS and have no related financial/business interests.
The 22nd Harwell ARS annual Radio and Electronics Rally takes place on Sunday 10th February 2019, 10:00 until 15:00.
https://www.g3pia.net/radio-electronics-rally/
In the past it's been worth a vist - I've acquired a number of 'interesting' bits of gear built using obscure late-50s/early-60s transistors and stuff which was clearly made using evening/weekend-job parts sourced from UKAEA or SRC stores...