Plumber needed

Hi can anyone recommend a plumber? we have a blocked lav unfortunately and don't want to spend a fortune to the dyno rod gang from the Yellow pages. Would also be interested if anyone in the West Green road area near Black Boy Lane has had any issues as the day this all started (7th Aug) I noticed a blocked drains van parked up on Langham Road with hose pipes leading into a pavement manhole thing, I went to speak to the owner of the van but there wasn't anyone around... anyway any recommendations would be most welcome...