There's some very useful pieces in amongst their ranges. I'm in the same boat when it comes to postal costs.
If it's of any use I did come across a UK based alternative from Blotz .Their Future Gothic range( could see any pseudo GW detailing on it that most Future Gothic ranges suffer from. Just a useable Gothic feel.) and their ruins range.
I've only put a small order in at the moment just to see if it needs much tweaking to fit in with my own plans.As I'm snowed under with work and other commitments.The set in the picture is the most expensive in the range and it comes in at £45. Most of the other buildings are much more flexible and come in under £20. Plus they sell the individual components of the larger sets.