Hi...can you give me some advice please?. I have lived here for about a year and for the last month only have had severe problems with water pressure ,even the toilet cistern (ALL my water is fed from the mains and not from a tank). In a split second my pressure can go from strong to weak...and even to a trickle...a trickle has happened twice in the last 2 days I phoned thames water and they had no problems. I realise that my pressure will drop a bit when other flats are using their water...but this is more severe than that. A plumber who I met in the car park told me he had replaced a valve supplying one flat only (didn't need access). ...would this be a pressure regulator valve?..and does this mean one valve per each flat of 44?...and could a faulty valve be my problem?...AND could this fail completely leaving me without WATER!. There is a "pump room"?? on the ground floor. One tenant on the floor below me (2nd) has the same problem...I have yet to check with my same floor neighbours....if I call a housing association plumber and the pressure is good when he comes will he take my word for the problem...or will have to see low pressure before doing a repair?....many thanks for any advice received.