If your flush valve needs changed and it requires the plumber to remove the cistern from the toilet pan, replace the fill valve at the same time. These parts can be bought in a toilet repair pack, so this offers better value for money when you have to replace a flush valve. It also means everything is new and can be replaced during the same 1-2 hour visit.
However…
If the fill valve only needs to be replaced, this can normally be done without removing the cistern from the toilet pan, so no need to also replace the flush valve. If you would prefer the flush valve to be replaced at the same time, please speak to your plumber.
We try as best as we can to replace your toilet parts with universal toilet parts, which means any future repairs can be done much easier, meaning better valve for the customer and less expensive future maintenance toilet repair bills.