Think "Notice" should be renamed "Advertising Notice". Only ever came accross one school that did a £3000 PPL and I thought they had moved away from that airfield and were not advertising business from the genmeral public where they are now.
"You get what you pay for" is a lesson hard-learned by most.
If it seems cheap, there has to be a corner or two cut somewhere. It may only lead to more training with any other place you go to fly before they let you lose with their precious aircraft.
An extra tenner will make no difference in the long run. Budget £6000ish and make your decision on aircraft, instructor and the atmosphere in the school. Ask a few students there.
Buy price, buy twice!!