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Have you tried calling I Repair Macs http://www.irepairmacs.co.uk/? They have a shop (!) on Goswell Road. Haven't needed them myself but heard good things before.
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Mark the Hampstead Mac guy is highly recommended. He used to work for Apple and has gone freelance because they encouraged throwing away machines/parts that could comfortably be salvaged. Sounds right up your street.
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friend of mine does macbook fixes, pretty much any type of part replacement. used him regularly at my previous startup company to replace batteries, fix fans, fix screens, new keyboards/trackpads, etc etc.
if you're north london, he can also come to you
Non Apple certified MacBook repair in London, can someone make a recommendation? I have an old MacBook and anyone official won't touch it and don't supply parts for it anymore, but the oem parts are available.