Head gasket problems

Hi all.
I have recently had the head gasket on my 1.9d talbot autosleeper replaced. I also had the water pump van belt etc changed at the same time. I notice that water is still being lost from my system especially when going up steep hills ie. when the engine is under extra pressure. It is not building up pressure as it did when the gasket blew but as I said it is still losing water somewhere. I just had a new raidIator fitted but it is still losing water albeit at a slower rate. The water I am losing would amount to approx 1 pint a fortnight. I also think that the engine may be running fractional faster since the gasket was done. Any thoughts would be grateful and thankyou in advance.