Very slow drip into cistern

[ames]

Hi
We have a very slow (one every 1-2 minutes) drip into our toilet cistern, which is resulting in a very slow drip from the outside overflow pipe. I slightly adjusted the amount of water coming into the cistern so it doesn't immediately fill so far up, but this hasn't made a difference as the dripping doesn't stop and eventually it fills right up again. Is this a problem with a valve or washer or some other bit that I don't know about?!
Many thanks

 

[HERTS P&D]

New washer is needed.

Post a picture of your float valve and I can tell you what you need.

Andy

 

[ames]

hi Andy
thanks for this. Here is a photo - hope it's the right bit! View media item 82767