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I recon the boiler will be damaged from its fall of the back of the lorry it was on. Are all three of those plumbers you've had round doing it as it's only taking one day. Anyway must get back to my patient who needs his brain putting back in.
I also found that leaflet drops worked better than anything else I tried. Had a guy print them and drop them for me. He'd tell me the area in the town that I live where he was doing and I would be able to gauge the effectiveness of it. Got a better response from that than adds in the locals...