I paid $446.39 including shipping to the UK for my Revo from Tower Hobbies, they only charged me $6.40 airmail shipping to the UK (their computer system messed up and that is all they charged me ). That's only £248
I've had my Revo since 23rd July and love it.

There are a number of places online that will ship to the UK try one of the following,

http://www.towerhobbies.com/index.html

http://www.stormerhobbies.com/

http://www.rcboyz.com/ (Savage SS 25 Kit £195 )

http://www.rcmart.com/catalog/default.php?cPath=420_328

http://shopping.rcmodel.com.hk/

http://www.rcxshop.com/default.php?manufacturers_id=7

Or try Ebay, there are a number of reputable sellers who will ship to the UK. Remember to ask first what the shipping cost will be!! Here are a couple I can vouch for.

http://stores.ebay.com/Hobbie-Guy-RC...isplayZ1QQtZkm (Savage 25 RTR £229 plus shipping!)

http://cgi.ebay.co.uk/ws/eBayISAPI.d...915220536&rd=1 (Savage SS 25 Kit £176 )

Remember though when buying from the USA you will probably have to pay import duty especially from places like Tower and Stormer, but from ebay sellers they may put down a low declared value on the package and you will get away without paying. Buying from Hong Kong you will probably get away without having to pay import duty.
I bought a Hyper 7 Pro PCR (UK price over £450 ) from Dinball for £191 and did not pay any duty