My mum bought a cheap 2000 £400 Rover 25 last year for a run around. The guy who sold it told us that the head gasket had just been replaced and that he had done the work himself. He even showed us the old gasket. One year on and the car has been boiling over for some time. The garage have been head scratching for some time thinking to just take out the thermostat but now it seems the head gasket has gone. Anyway, they have quoted £450 which is way too expensive for this age of car. I have been looking at some of these sealants you can buy and was wondering if they are worth a gamble just to keep it going for another year or so ? If not, what is the average price of a head gasket replacement at a garage as we could shop around ?