We had our annual boiler service on Monday. Guy asked "any problems", no its fine. Footered about, "thats it done" & left. I put on the heating & lo & behold, water pouring out.. Switched it off, phoned the company so he arrived back an hour later. Footered about again, "thats it" & left. I started tidying up, then noticed a drip. F##k sake, but he was in his van, so came back in. Changed an O ring then said "That nut is not tight enough" so got out his grips,. I was a bit concerned as it was a plastic nut, but he is the "expert", "thats it" then left. I had a good look but still a slight weep. Double F##k sake, rushed out, still in his van. Back in "think we need to replace that bit & looks like the nut is split. Surprise, surprise. Will take a couple of days to get it" Weep was not much so I said ok. That day the stat would not get past 18 deg (its set to 23degrees & no problem before he came), next day the same. Treble F##k sake. Anyway, phoned to say part was in. Another guy came up, had a good look. Original guy fitted the wrong washer & forgot to order the replacement nut. Words fail. This guy said he will come back when I relayed the tale of woe. Be next week now. Await part 2