i now have more info on the problem.....

fitted the single piston baileys dump valve...and away I went. half an hours drive into aberdeen, picked up my mates ans went to James blunt concert. All going excellent, although temp is looking kinda low. Nice loud psssssht. Came out of the concert and dropped them off, went for a lap down town then BANG (no it didnt blow up) but as soon as i put the clutch in it cut out. Started it again and away I went. then a set of lights so braked, dipped the clutch and whey fuckin hey the lights on the dash AGAIN. The temp gauge was lower than ever and this is after its been running for a while now. Obviously your always better cold than hot but this was silly cold, like hardly on the half moon. So im thinking an air leek. And more so I want to know what I can do to have a dump valve successfully.

Its back off, much to my dissapointment