Water leak from WC

[Rangirl]

But I can't find where it's coming from Any ideas

lift off the cistern lid and see if it is excessively full (the correct water level will be marked on the back inside the cistern)

Look at the supply pipe that goes into the bottom or top side of the cistern

Look at the ledge at the back of the pan that the cistern sits on.

look at the soil pipe that comes out of the back of the pan.

Could be condensation at this time of the year. Get some kitchen towel and dry off cistern . Then have a look for leaks