You don't think I've actually bought new filters do you? :-) I reverse blew mine out using the 80psi airline at work. Almost got the dirty side back to it's original colour.
The OE price is $30.69 according to RealOEM.com. I've found halving the dollar price for pounds seems to give a fairly good guide price.
You're right about the rubbish though. The worst car I've ever owned for having so many traps around the scuttle area for crap to get lodged. Mike.