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What do you guys think about this. We've had someone come to give us a quote for a new boiler + installation + update of our current plumbing system. He claims to be Corgi registered but won't give us his Corgi number until we've gone ahead on the quote and he says this is normal practice. Is...

Hello, This isn't strictly a DIY question, but you guys seem very knowledgeable, so I hope you don't mind?!? I'm looking to get our central heating system modernised by installing a combi boiler and getting rid of the water tanks etc. Several plumbers have come round to give us quotes...