Range from the cheapest replacement of a toilet float valve £53 (W4Plumber.com based in W4) to the dearest replacement of a float valve £85 (FD Plumbing & Heating based in W4).
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 W4 5p by posting a job with HaMuch and we will send it to plumbers in W4 5p.

"I need to check the Valverde in my toilet but the cistern is in the wall"
W3