I left mine for 6 months last year, away a lot somewhere hot and sunny, but keep your head down!
I washed the car, usually leave it with fresh oil in, put a sheet over it and fit a battery optimiser, trickle charge the battery. Had no problems at all, always started first time, thats the longest i have left it, but 2-3months on several occasions.
Always cash the tax in as well!
Dave