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I have no idea what it costs to do but it's annoying I've watched my old man do it for nothing (he has some plumbing tools though) and here you need to involve Thames "We don't know where you live" Water if you need to move a meter. I could probably just isolate the cupboard pipes and remove everything in there myself and save a chunk of work but doing it half DIY and half with the tradies will presumably slow stuff down (and I've not looked to see if it's possible, if there's enough valves to do it).
£800 to move some pipes, honestly we are too cheap.