Range from the cheapest price to Unblock a sink £50 (Kaloyan Vasilev based in E16) to the dearest cost to Unblock a sink £160 (LTT plumbing based in E1).
Comparing plumbers estimates for unblocking a sink 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 unblock a sink in E14 9 by posting a job with HaMuch and we will send it to plumbers in E14 9.

"Unblock a sink"
E14
"Unblock sinks in two bathrooms"
SE10