Range from the cheapest replacement of a toilet float valve £40 (M & M Plumbing & Heating Engineers based in UB5) to the dearest replacement of a float valve £89 (Macklin Plumbers based in ub5).
Comparing plumbers estimates for replacing a toilet float valve in the cistern tank gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to replace a toilet float valve in UB4 by posting a job with HaMuch and we will send it to plumbers in UB4.

"Replace float valve in toilet cistern"
UB5
"Replace float valve in toilet cistern to ensure it flushes properly."
UB1