Very polite when arrived talked me through what he was going to do and got straight to work when the job was done he explained why the drain had blocked and gave me advice on how to prevent it from happening again in the future.". Derby pitch fibre pipework problems. What does it do? should you switch your boiler to eco-mode? is it cheaper to fun than the standard setting? Don’t be afraid of asking questions – image by oberazzi (flickr cc). New haven and fairfield county license numbers: 10074,394664,4388,281249.