8BS, SOLINET, BBC User Group and EUG are still active. Software disks can still be purchased from them. Disks are typically 50p an issue if you supply the disk, UKP 1 if not.
SOLINET
c/o Ron Marshall, 41 Westbrook Drive, Rainworth, Notts, NG21 0FB, UK
BBC User Group
37 Ceylon Place, Eastbourne, East Sussex, BN21 3JE, UK
c/o David Edwards, 42 Canterbury Road, REDCAR TS10 3QF, UK, Tel: 01642 479837,
E-mail: s-d.edwards@tees.ac.uk.
Supports all 8 bit Acorns, still produces monthly BBC/Electron disk magazines, UKP1 each (incl. disc).
I don't really know if any of the following are active (in relation to the BBC, that is). I found the information on the net, and gathered it here for reference:
Acorn BBC Users' Group (UK)
Contacts: President, Colin McLeod 385-8550; secretary, Graeme Farrant, 389-1076. Meets second Friday of month, 7.30pm.
(Found here)
Users' Groups