Flush valve replacement. What make is this?

[Gem1983]

Hi everyone. Being driven mad by a leaking toilet. 2 in fact!! It’s not the fill valve over filling to the overflow so assume it’s the flush valve.
Anyone know what make this is? The fill valve says WDI so guess the flush might be the same? If it is, is there a compatible valve I can fit in the basket?

 

[Aquarius]

Looks like it could be wdi, perhaps email these? WDI - toiletspares.co.uk - https://www.toiletspares.co.uk/wdi.html