I run the WARPAC Cold War Airsoft page on FB. The 'scene' is in pretty decent health with a hardcore of around 80 players plus another 100 or so who come and go. You tend to get around 30-40 per side at events weather and location dependent. You would absolutely be welcomed by the Brit side and they are a good bunch of lads (if on the wrong team). Check out the kit guide here : www.coldwarairsoft.com.
Next game is at Tuddenham in Norfolk on 23rd Nov, will probably be a smaller game as Tuddenham is difficult for people to get to. The games at Eversley will recommence in the New Year probably around March time. There are usually 3 games per year and you get the same groups playing on each side pretty much. They are easily the best airsoft events I have been to - but they are not milsims! They are FILMSIMs, don't go expecting a milsim. I personally think that they have got the balance spot on. There is never any drama or such like and no cheating. Once you have come to a good Cold War game you wont want to play a skirmish again.
Any questions yell.