Does anyone know a decent place with air gun to fit coilovers around Birmingham area? Thanks

Yep!
Go to BMTR in Perry Barr, they will do it all for you etc, and are motorsport guys too. Call them first, ask for Dave or Paul.
Their main business is tyres of ALL types, but they are H&R dealers too I think.
911

Yesh, i know Dave. I didn't know they did any motorsport stuff though. Everytime I've been to them with any Scooby related stuff, they've never been too helpful, though... maybe they just don't like me :(