Toilet leak but have sealed the pipe still leaking

[Jeff543]

If the float valve is dripping, which I’m pretty it will be, after flushing the water will quickly rise to the normal height, but then continue to slowly rise because of the leaky valve.

If the water never got to the overflow height, there couldn’t be a leak from it.

Yep i now realise that, after a toilet-flush the valve is still dripping long after it should be.
I can't seem to adjust the contraption to close the valve. I think the valve must be knackered because even i move the ballcock to close the valve it's still dripping. .

On the modern ones you can just turn the screw-top clockwise.

Mine isn't like that

 

[Jeff543]

The silver hook connects to the little black lever above it. The toilet can't flush without it connected ??
The float valve that controls the water flow into the cistern needs servicing ,or replacing in my opinion. Does water continue to drip INTO the cistern from that valve ?

yes

 

[Hugh Jaleak]

Replace Valve, https://www.wickes.co.uk/Fluidmaster-1-2''-High-Pressure-Brass-Ball-Valve---Part-2/p/150178 If Float is past it, then replace that too. You will also need a 1/2 Fibre Washer to go on the end of the Tap Connector that attaches the supply to the Valve. (Turn water off before undoing anything!) https://www.wickes.co.uk/Primaflow-...Pack-Of-10/p/421633?_br_psugg_q=fibre+washers

 

[Jeff543]

Got the level down, this is where it rests now.