boost
 

my car been boosting at 0.5 bar anyone know why this could be

In limp mode
Boost control solenoid failure
Or boost control hoses plumbed incorrect with missing restrictor valve.

wouldn't have a clue where to look for all them mate

where can i buy one from

Buy what? You need to have the fault identified first by someone who knows these cars.

You could try these guys, they're Subaru specialists and well recommended:
http://www.southeastscoobies.co.uk/v...ead.php?t=8595

maybe i will take it to them they are only down the road from me aswell

Or go and see Tony in Sedlescombe.

didnt know there was anyone that close to me :)

Does it feel slow, or you going by what the boost gauge is reading? From experience, I'd start with the boost gauge, make sure there's no cracks/holes in the pipework then expand from there.