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Thank you all very much for your advice. I will check the stop tap under the sink but it should be ok because we had a new sink put in last year by a qualified plumber. The toilet is the new type, 3 years old,. We are on a shared supply with the other half of the semi. They had a new kitchen in last year and put their washing machine out into the garage - problems seem to have arisen since then. Maybe this is a coincidence. If the problems are through a shared supply, is there anything we can do about it? If the kitchen tap is turned on, not a spot will come out of the tap in the bathroom.