For no reason other than because, below is an alphabetical list, which doesn't pretend to be exhaustive, of the UK-based stations heard on shortwave during the 1990s:
Radio Ability
Angel
Radio Armadillo - the middle A.
Atlanta Radio
Radio Atlantis - West Midlands-based.
Belgian International Relay Service - not Belgian at all.
Radio Blackbeard - Dave Norris.
Bogus Jobseeker/Bogusman - when Radio Orion became the Mike Wilson project.
Britain's Better Music Station (BBMS) - a subjective moniker.
Britain Radio International - Roger Davis; Jayne; Steve West.
Citadel Radio
Radio Confusion - the forerunner to Subterranean Sounds. Steve Midnight.
Radio East Coast Commercial - the late Norman Nelson.
Radio Experimental/EXP
Free Radio Service London (FRSL)
Freesound Radio
Radio Galaxy - forerunner to Radio Merlin.
Galaxy International - collaborative project of Dave Norris, Paul Stuart, and Mark Perry.
Radio Geronimo - the late Chris Watson.
Radio Gloria - Alan Hayes.
Good Music Radio (GMR) - a sweeping statement. Suffolk-based.
Lightning International - Manchester address. An elusive, low power operation.
Radio Lion - logged once (not by me). No further information.
Live Wire Radio - Bill Lewis.
Radio London - Andy Winter.
Radio Merlin - Paul Watt. P O Box 293.
Radio Mi Amigo - Terry Phillips.
Midlands Music Radio - what it says on the tin.
Radio Mirage
Radio Mutiny - forerunner to the Xenon Transmitting Company. Tommy Teabags.
Northern Ireland (Shortwave) Relay Service
The Nitrozone - successor to Total Control Radio. I never heard either.
Optimod
Radio Orion - Mike Wilson; Rod Lucas; Paul Johnson (see UK Radio), et al.
Radio Pamela - continues to this day. Steve Most.
Radio Pandora - as above. Steve St. John.
Rocket 48
Sierra Foxtrot 0 3 - QSO station. Brian.
Station Sierra Sierra - Paul Stuart.
Subterranean Sounds
Total Control Radio - Des Francis.
UK Radio International - the late Paul Johnson. 6266.
Weekend Music Radio - Jack Russel. Fancy Pants.
Wizard's Magic Spell (WMS) - Sniff 'n' the Tears.
West and North Kent Radio (WNKR) - Andy Walker; Dave Martin.
Wonderful Free Radio London (WFRL)
World's Greatest Anorak Station (WGAS) - other jackets are available. Nostalgia.
Wrekin Radio - 12 MHz.
Xenon Transmitting Company (XTC) - the evergreen Matt Roberts.
Radio Zodiac
Radio 48 - the first free radio station I ever heard.
There will be others I have forgotten, perhaps even those written about in previous blog posts or mentioned in dispatches.
It would be interesting if someone 'who was there' could compare the amount of UK-based stations heard on shortwave during the 1980s. I suspect it would be a far larger number.
Honourable mentions must go to several stations who I simply did not hear but were active at the end of the decade and into the early noughties, some of who continued to broadcast several years hence. These include the Grolschman, Focus International, Radio Underground, the Groovy Granny, a short-lived station (Radio City??) operated by Mark Perry, Uranium - which later became the contemporary Valley Wave Radio, and Oscar the Engineer, the person I think who was behind Radio Skeleton and Radio Antares.
Two anomalies were Radio Fax and Radio Stella International. For all intents and purposes from the UK, but who actually broadcast from the Republic of Ireland (Eire).
Those were the days, my friend.