Agree. Half a dozen people have taken a cut of the money. The poor guy at the end turns up to a badly surveyed job, with the wrong boiler and not enough time to do the work and has to pick up the pieces.By all means you can try email national supplier with photos and your concerns and say your withholding the £300 final payment until the work is satisfactory, by satisfactory I mean working correctly and everything serviceable. Poor looking fittings and large drips of solder, unfortunately don't give you much of a leg to stand on.
For future reference, a proper engineer would not have attempted to do your job in a day, it's 2 days minimum to flush and install, takes longer but you get workmanship you'll be happy with. When these larger firms subcontract the work out, it's a set price and the only way the engineer can make any money is to rush the job. In future, employ a local engineer with a good rep.
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