Ive just had an email from JSTransport and a quote of £189 all in. Sounds good to me 
Or could you spend the extra £149 on a new head gasket? and get a free lift. Deal or no deal.
I'd go with that and get Greenflag or whoever to Tow you back.
In my experiance these guys are good, my boss had a Megane (new shape) the battery went flat, getting out with side lights on it does not warn you with beeps or anything.
Took one look at the millions of connections on they battery and thought ... er no. He did not have RAC cover so rang them up.. and registered. Then called them up..... they said sorry no can do for 48 hours!

Soo i rang up with my RAC card "We broken down in my bosses car" - bloke comes out... after a little chit chat we explained i called him out after my boss could not get them out even though he just registered. He was very good about it and gave some good advice.
I'd get it towed back via RAC/AA/Greenflag or whoever, i am sure you could come to some sort of arrangement with the driver

All in theory of course!
