Thanks for all the info everyone!

I Googled most of the afternoon and turned up Eagle Global Logistics who have an office in Charlotte.

Total cost: $155 for their door to LHR. Ok, I have to drive to Heathrow and back but that's a small price to pay!

I got the Caprice shipped over this summer - *very* stressful and not recommended, especially when Wallenius Willhemsen can't find your car on their system. Took 2 days to find out it was delayed by customs, meanwhile my hair was going grey! It was only an $1800 car, god knows what it'll be like when I get a Viper! (in my dreams!) I am also glad that I got total loss cover considering the recent evidence regarding the navigational skills of their crew....

Gareth