The upstairs bathroom has a problem with the cold supply to the bath and basin. When the taps are turned on the water flows weakly for a few seconds and then stops.

The bathroom is fed from a cold storage tank in the attic as normal, and I have checked and that is full and the ballcock working properly, nothing unusual to be seen in the tank. Only thing is lots of scale in the bottom of the tank (we live in a hard water area), but the outlet pipes are a good inch or two above the level of scale and nothing obvious is blocking the pipes.

Any ideas what I could do to help figure out the problem, or to fix it would be appreciated !

Cheers

Could be an air lock, any ideas what I could do to shift it ?

Thks