In reply to Daysleeper:
The dealer will try to entice you with gap insurance, if you decide you need it don't take it from the dealer, go online to ala.co.uk - much cheaper. Also do the sums for mileage, I normally do 20k miles pa, if I tell the dealer that the monthly payment goes up. If I say I do 10k I pay the excess mileage charge at the end of the lease which is much less than the incremental monthly payment I'd have made if I made the initial contract for 20k pa.