Got a mystery here: I just moved into a new house and the toilet tank in the 2 piece bath on the main floor is suddenly not filling.

I unscrewed the feed line into the tank and tested to see if there is water flowing through it and there isn't. The sink taps both work fine - just no water into the toilet.

I'm assuming I'll have to call in a plumber, but I thought I would check here first.

Ther's something blocking the branch that supplies the toilet. I would shut the water off at the house stop and ope4n up the chrome angle stop. Clean out the seat and hold a pan over the open valve while4 someone turns the water back on for a minute to flush out the branch. You should have a full stream before you reassemble the angle stop. Good luck

Attic tank is full but no water flowing to upstairs sinks or toilet - not ice blocked

Where are you located? Sounds like UK and on a gravity feed system?