Or not as seems to be the case. Our cold water pressure went right down on Sunday night. The only reason we can think of is that air might have got into the system when filling up the aquarium on Sunday with the tap being turned on and off over a couple of hours.
I rang the water board and they confirmed that there is no work going on nearby and suggested turning the stop-cock off and on a few times with the kitchen tap turned on. It took a phone call to the former owners to find it, in the dining room, silly me was looking in the kitchen lol. We found it boxed in the corner and I had to remove a section of plywood to get to it.
We tried turning it off an on a few times but it didn't work, we tried the sink tap in bathroom upstairs and that was as bad. The bath tap was fine and ran for ages with the water off, so that must be coming from a tank. The loo cistern isn't filling up very quickly so that is affected, however, with the sink tap just trickling out water, it sprang to life when I flushed the loo, opposite to what I was expecting.
We'll try some more experiments tonight, the former owner said running the cold water in the bath should sort it out, can't see why but we'll give that a try.
We'll probably get home to find Yorkshire Water vans on our street trying to find out why half the local reservoir disappeared overnight lol.