I rented a Ford Galaxy while visiting England and France earlier this year. Someone searched for the "possibility of sleeping in Ford Galaxy with seats down"
If you search again the answer is NO. The one we rented there was no way you were going to sleep in this thing unless you slept in the seats and I would say that the two front seats would be the only ones that would give you a chance to sleep.
Herts at gatwick wouldnt let us take out a few of the seats....
If your going to travel England plan ahead and book travellodge a month ahead... Just 15 pounds a night. 26 pounds if you book a week ahead.