on closer inspection i was completely wrong, the water feed pipe had a minute split in it and this explained the loss of water, the water i thought was in oil is in fact fuel, i took all the plugs out and no 1 was black, i think no 1 injector is stuck open which would also explain why its used 7 quids worth of fuel for 25 mins running at idle, a bonus in some respects, i'd rather replace an injector than pull the engine apart again!, thanks for your input guys!!