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petercj
Yeah it is localised. I've called someone who said, based on what I've told him, he can do it for £20 - £30 quid.
That's good - probably not worth doing yourself.
Having looked again I see you need a 22m coupler, which is £6.84 anyway.
22 x 100mm Straight Coupler Compression - Compression - Plumbing -Tools, Electrical & Plumbing - Wickes
You mentioned a water hammer earlier, so will be worth checking to see if the pipework needs a clip or two.