I was taking a shower yesterday and the water suddenly stopped coming out. Both the hot and cold taps in the Bath and the bathroom sink have no water coming from them and neither does the hot tap in the kitchen. The Cold water tap in the kitchen is still working normally. I've got a Header tank in the loft that feeds the Hot water tank in the airing cupboard, which is heater by an immersion heater (this is still working and the tank feels warm). Does anyone know if this sounds like an airblock since it is both hot and cold taps? Do I need a plumber? Any advice appreciated, thanks