Quick and easy. For car shipping from the US to the UK, US military service members need the original title, or original notarized lien letter with a copy of the title, for the vehicle as well as their PCS orders and passport or EIN as the US documentation export requirements.
Having purchased two new BMWs myself, I have been in situations where I looked up several resources on how to track my new BMW from its early ordering stages, to production status, ship tracking and all the way to being loaded on the transport truck.
The price to have your car shipped to a marine terminal (truck transport) will depend on your specific location in the country and can start Bookmarks from a few hundred dollars if you live close to a shipping dock up to $1,000, or even more if you live in a Midwest state, for example.
Getting a package from the USA to the UK takes around 3-5 business days with express delivery methods (DHL Worldwide Express), about 6-12 business days with slower delivery methods (USPS Priority, Postal Service ePacket), and about 13-20 business days with the slowest and cheapest delivery methods like Planet Mail Express.