Stick a trolley jack under the towbar to get it off the bump stops and see if it will go up at all.
If not crawl under neath and stick some wood under the bump rubber.
Thanks for that sounds like a really good idea i wish i had thought of it.
After spending an hour wrestling with the tow bar i finally got the end of it off i figured that would give me just enough clearance to clear the drive, so i thought i would get the Mrs to back the Disco up while i watched the back to make sure all was well, as soon as she started it hey presto the blommin thing raised up off the stops.
Is that what they call sods law!!!!
Still at least it is off the drive now and i can get it to the garage on Monday.