One thing I would check if going for this deal is how much less it would be without maintenance. 20k miles won't require much in regards to tyres and servicing unless you drive like a tit everywhere. 1 set of tyres and an oil and filter change will be around £750 if you shop right. If it's a car for the wife (which is what I do) then I wouldn't go near maintenance on a low mileage lease, all the car will need is an oil change over 2 years.
TC - yes you will need to get any repairs sorted when the car goes back, but if you spanked a kerb or scuffed the lotus on a post, would you just leave it or get it repaired?!?!
I can't see how that is any different to be honest, unless of course you run round in a £500 sh*tter?
The wife changes her Citroen C3 this week for a A1 S-line (both on lease) and we have just had 2 big scuffs smart repaired on the back bumper (whole bumper sprayed), whole side skirt painted, bottom of the passenger door filled and sprayed and also the mirror cap. £350 all in and a cracking job too believe it or not. Either way the car goes straight to auction.
You just need to make sure that you don't give the lease company any reason to bend you over for any repairs (scratches, dents, chips in windscreen etc). That's where they'll get money back if you're not careful.