Toilet fill valve ID please

[Blenkiron1]

Hello, as the title, the cistern keeps filling.
The fill valve is passing, think it’s a viva skylo bottom entry with a plastic shank but there’s not markings or identification on it. Just wondering if anyone knows what type it is?
I’d rather just replace the diaphragm inside if it’s one that’s replaceable? Think it’s just twist and pull it up.
Thankyou 👍

 

[ShaunCorbs]

Not a viva just a cheap one will need to re replaced for either a viva or fluidmaster one