cistern over-running

[royboy123]

My cistern is passing water into the toilet after it is filled up, very, very slowly. I can probably live with it, but any ideas how to stop please?

 

[Puddle]

It maybe over flowing in which case adjust ball float or replace washer or if push flush type could be rubber seating of syphon if so clean,silicon greese

 

[Tosh]

what type of cystern do you have? push button or lever flush??

 

[royboy123]

lever activated

 

[secret squirrel]

I agree with puddle or just replace the inlet valve, ball valve assembly or torbek type fitting.