Hey dude, this looks like the route:
http://www.multimap.com/directions/...ap=51.8222,-1.10962|9|4&bd=useful_information
By the sounds of it will only be on the M40 for one junction, are the services between jct 8 & 9?
http://www.multimap.com/directions/...ap=51.8222,-1.10962|9|4&bd=useful_information
By the sounds of it will only be on the M40 for one junction, are the services between jct 8 & 9?