although it sounds a bit daft have you thouht about picking up a cheap car from the papers you can pick up all sorts for a few 100 quid, should be good enough to get you on holiday and return. you never know you might be able to sell it for a profit when you return
other option since its just the drivers side door, have you though about trying to do a quick fix by getting a spare door regardless of its apperance, change the lock around 2 hour job max,
one more option could be ask a freind of family member to borrow there car for your holiday, quick change of insurance and your on your way