Just thought I'd confirm a few things....water leak was due to a damaged thermostat housing where it bolsts on to the block...seal had been "sucked" in and leaked, I've had the car 3 years and it just suddenly does this ! New Housing was £18 from GSF O rings and Thermostat added another £14 and the correct antifreeze was another £18. Replacing it as previous post suggests was about 2 hours...although I ended up using jubilee clips rather than try and get those b'stard clips back on the hoses !....Fingers crossed all seems ok. Thanks for the advice/guidance.