Do you have access to a dolly or trailer?
Both a dolly and a vehicle trailor that tilts etc so you can drive a car on....
and Boycie.... though that seems simple and easy enough, if caught.... it can pose nice fines and points, which isn't good when the person who would be towing it has 6 points.... and is a lorry driver for a living so cant really risk losing his license....
The other thing also... my parents/brothers etc were to drive back over there to get smoeone to tow it they may aswell give it a go of fixing it whilst there, whcih is the current plan, though expensive... its the only way to get it back atm....
Im sure if they cant fix it for whatever reason whilst they are there then itl be easier to find someone wholl take it to the ferry whilst at the ring rather than finding someone online from england....
The other thing being once its in England.... RAC will tow it home, so getting it on a ferry is the main issue as if it breaks down after that then itll get a lift home