On Sunday 22 September in the morning our upstairs bathroom taps were running normally (we have excellent water pressure in our area). In the evening I tried to use the hot water taps and it was as if the water had been turned off at source. In fact I assumed Thames Water had turned off the supply somewhere locally which has happened on the odd occasion. However both upstairs cold water taps gushing normally. Also the Vaillant combi boiler located in kitchen was making a sort of whooshing noise it never usually makes when either of the bathroom hot taps are turned on (sounds a bit like the noise a kettle makes when first turned on). We assumed the problem was caused by boiler fault and called boiler service. The guy came round and didn’t even open boiler and said it was water pressure and left, didn’t believe him and called them out again, second guy said the same thing or that we could have a leak. Called Thames Water and the guy said definitely nothing wrong with water pressure (which we knew ourselves as upstairs cold water taps gushing normally) and he said definitely no leaks. We called a plumber and he didn’t seem to know what the problem could be. My husband took upstairs bath tap off and poured lime scale remover down pipe but it continues to run really slowly as if there is some blockage. I’m still not convinced it’s not a problem with the boiler. If it was scaled up pipe how can it happen so quickly…surely the taps would gradually run slowly and not suddenly? All heating and downstairs taps running normally. Anyone got any ideas?