I believe the only differences between Saloon and wagon is the rear of the car. So Engine, bonnet, doors etc are all the same. GX just doesn't have the scoop. So yours will be a sheep in wolfs clothing lol.
I'd recommend Matty. He's a breaker who ships. You could give him a call and tell him you have a bug wagon in 01g silver (by the look of it?) and ask him what he's got. He's shipped a few things for me in the past (I am in Surrey too).
Heres a blob he has. I don't think this will fit yours but you can see the prices and the kind of thing he does.
http://bbs.scoobynet.com/full-cars-breaking-for-spares-438/1009295-blobeye-04-sti-breaking-01g-silver-brembos-6speed-sti-styling-and-interior-more.html
MB developments Unit 3 Addenbrook street Darlaston Ws10 8hj call or tx for quicker reply 07785942237
p.s. Hope Gambit and Steve don't mind me linking to other sites. Just trying to be helpful :)