Not quite 30K, but yes, they are depreciating quite a bit just now. When I was looking in May 2004 for a car they were holding their value a lot more than they appear to now. At least in dealers.
Have you looked at an import Gareth? I got a Euro Import WRX brand new for £16K. STIs can be had for £21K I think.
I should also add that although they depreciate financially they'll always be appreciated round these parts.
BADOOM TSCH.