New coolant cap fixed the hissing cap problem. Few weeks later and the top hose of the radiator has come off. Joy.......Thats both of them that have come off now, luckily I noticed right away both times. This time however it seems there is a misting of oil/water around the head gasket. :(Engine sounds like a bag of nails some days as well due to piston slap, warranty ended just the other day so give it a week til it all goes Pete Tong no doubt! So skint!!