Thanks. Yes, tank drain was a panicky first reaction...
Mrs G has phoned plumber - he thinks he may have left a stop cock turned off and is going to come back.
at the top where the water comes in at the level of the ball device. a fine spray of water was coming out.
draining down and gradually turning back on seems easy enough but will it definitely work?
Is it reasonable to ask the plumber back to solve the issue when it was me who emptied the tank prior to his arrival?
Google has offered a "hosepipe method" which sounds tricky. There is also a more promising "draining the system method" - should I attempt this as a DIY job?
Had a plumber in this afternoon to replace a washer in the cold water tank. Now we have cold water from sinks and basins but not baths or to refill toilets. Anyone know why this could be? Tank in loft is behaving normally.