It seems to be the season for plumbing related queries so I’ll add mine :p
My kitchen hot water tap sometimes has a really low pressure and I can’t figure out why. I only have two hot water taps in my house and the other one (in the bathroom) never has the problem. I’ve also tried the bathroom tap when the kitchen tap has low pressure and the bathroom tap pressure is still good.
When the issue occurs it usually starts about 1/3 to 1/2 normal pressure and gradually decreases (over about 10 seconds) until it’s not much more than a dribble (it usually runs cold at this point to but I think that’s just because the demand isn’t enough to kick my combi boiler into hot water heating mode?).
Sometimes when this happens if I turn the tap on and off a few times in quick succession the normal decent pressure comes back, sometimes this doesn’t work though (but if I try it again a couple of hours later it’s usually back to working properly).
I can only think it’s some sort of air lock or physical blockage but from what I’ve read you shouldn’t be able to get an air lock with a combi boiler (I might be mistaken on this) and I wouldn’t have thought a physical blockage would be so intermittent. The tap doesn’t drip at all and seems to turn the same amount each time I use it so I don’t think it’s washer related?