Hiya
there's quite a few of those Mustangs around and start from around £12000 for a 2004 coupe type. have a look at
www.autotrader.co.uk for local UK pricing on Mustangs.
I found a site here which uses good plain english to cover all aspects - the good news is that according to this (and if it's up to date with legislation) you might get away with paying VAT and the Import duty - so long as you can prove you've owned the car for at least 6months prior and dont sell it here within a year.
http://www.import-car.info/To ship the F150, I seem to recall around £1250 +VAT - but made the mistake of using an 'open type' delivery container - so it arrived very very very filthy. We were also told it was extremely lucky it hadn't picked up some minor scrapes and damage! we were then told to always use a 'closed container' to ship - it costs more of course ! I can only imagine the price has risen since 2004 (upon landing - we had to pay the VAT and Import duty and that added a substantial amount to the pricing of the truck at the time!) so I'd estimate for a closed container it'd be around the £1500-1600 mark (around $3000-3200 range) if you can find a US agent cheaper then great. Bear in mind you may have to get the car to the shipping port location, I cant remember if the shipping quote would include that or not.
Once here, you'll need it SVA tested and modified mechanically to be UK road legal. I'd budget around £250-350 for the SVA test and maybe £250-500 ish on getting it road legal.
Have a look through that site and it should answer all your queries - and let us know if you do go ahead with it !
Cheers! DtM! West London & Slough UK!