Ive just had a new tap put on my kitchen sink and now there is a small drip from one of the old joints just below where it was connected. I'm looking to put a new flexi pipe in to replace all the old bends in the pipe work but the stop tap isn't the best at stopping. The leak is on the hot side, if I were to isolate the inlet at the combo boiler would this stop the flow or would it cause a problem at the boiler end?