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From what you've described it sounds like you might be right. Happened again today, seems like its loudest at the top of the cylinder so i'm assuming that the washer/ballcock that needs replacing will be in there. Not so easy though, the cylinder is in a stupidly tight cupboard! Will let...

Its a vibration from the cold pipe to the water heater (Gledhill Economy 7 water cyclinder). You can be running the hot or cold tap when this happens. Sounds like someone is drilling into a wall. All I can seem to find online is that its water hammer, but the only example I can find is on...