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OP try doing a search on gumtree/facebook/ebay (make sure "include description" is checked) for Ultegra/Tiagra/105 (decent groupsets), then make sure the bike is your size and has decent reviews. Plenty of aluminium framed bikes with carbon forks in this range for £270-£400. If you're quick on the draw you can find something for as low as £200, or a fully carbon bike within the same price range. Attractive deals get snapped up quickly so it helps if you're an autist who can refresh a page throughout the day, or at least set up an instant alert. I don't think you specifically need to chase after specific brands and models as long as the groupset is legit.
t. got a bike that sold for £1000 new, goes for £600ish used (£450-£500 pre-Corona), for £320 this way
