I have refilled my fresh water tanks and emptied the grey and black tanks(thanks for the advice re putting two sacks of ice and then driving around, this seemed to clear the level indicator light problem I had and all is showing ok)
I think, as I have only had this camper for a week or two that the taps need new washers, as its logical that if it still leaks when closed that's the only thing it could be and perhaps the first small weekend I did not notice, at least now the water pump is pushing it up and closing . at least until it looses pressure and senses the taps are still leaking , once I turn off the water pump the water flow in the taps slowly stops,
Thanks people.