Help with broken toilet please

[Renonewb1e]

I’m pretty sure it’s the refill valve, however I’m struggling to find a replacement part online.

I’ve tried readjusting the float valve, but this part is still continuously leaking water, causing it to run into the toilet bowl, I don’t mind replacing the entire float & refill valve system if I can’t just buy the grey section by itself, but I can’t even find that!

I’m sure I’m just being stupid, but could someone point me in the right direction please (I really don’t want to have to pay a plumber as I can’t really afford it right now 😬)

First let’s see if @pigletjohn is still about.
Then, try posting to the DIYUK group on Reddit. They are really helpful.
Finally, someone who knows stuff might turn up.

I don't recognise it. Have a look for a brand name.

Also, stand back and take some wider pics, of the entire cistern, inside and out.

Does the water supply pipe enter from the side, or underneath? Copper or flexible?

Is the water rising over the overflow pipe?

You can also try here
https://www.diynot.com/diy/forums/plumbing/

Don't tell them you are a woman, unless you also say you are a grandmother. A few of the plumbers are unmodernised

Thanks @PigletJohn i managed to find it with google image search (Wirquin Jollyfill 1/2" BSP Telescopic Bottom Inlet Float Valve).

unfortunately I’ve realised I have no idea how I’m going to replace the part as the cistern is under a built in counter which has our sink on it 🤦🏼‍♀️

If you post the photos and answer questions I may have an idea