A little light persuasion has separated seat from rail, as it inched down this appeared:
Much joy at an id and also the condition of the internals.

Hello Bill, I was surprised myself. When someone tells you about an ‘ejection seat out of the helicopter’ I nearly didn’t bother looking. Double stupid as I’ve also attempted to rescue a ‘hostage’ from the same seat on school paintball outings a good few years ago. I probably didn’t get as far as the seat though! PM sending!

There are several on line and here on the forum. Google task force paintball and you will be rewarded. I didn’t take any myself. According to this link it came from the sadly defunct Wales Air Museum at Rhoose in 1991.
http://cardiffstathan.blogspot.co.uk/p/local-airfields-helicopter-landing.html

Thanks for the info Martyn, nice to know what I’m looking for. It does have the gun and rail, making it more of a challenge to manhandle. Perhaps Shoreham will move things along a bit, ebay prices for seat parts are ‘challenging’. The Whirlwind is/was XG592, and is well perforated with corrosion and battle damage.
Nice seat Steve, and quite a collection of models too! My old ATC unit had the full set, Victor, Valiant and Vulcan. I rescued the Vulcan seat (XH534) when their museum closed but the other two had already gone.