Next problem, running temperature seems low. I noticed it on the last drive before I parked up to sort out this air leak and measured it today with the data logger.
Takes ages to get up to temp, sits on 70-72C. If I stop for a while it'll come up to 90. Go again and it'll work it's way back down again.
It's cold at the moment but I think the thermostat may be gone as well.
Interestingly the temp gauge in the car will read 90C from about 73C onwards