• I haven't trawled the whole conversation to see if other people have suggested this, but would it be worth updating the OP with the following bike-recovery strategy?

    I had a bike stolen in February, and I set up a bunch of saved searches on ebay and gumtree, using a variety of search terms ranging from the exact make and model, to much more generic terms, and every morning I'd get an email with pictures of all the new listings.

    A stolen bike can take months to reappear on places like Gumtree and eBay, and it's unlikely you'll still be checking every day by that point. About three or so months later when my bike reappeared on Gumtree, the fury had long since dissipated and there was no way I would have been checking those sites daily, but my saved searches caught it and I was able to rock up with the five-oh.

    tl;dr: make a bunch of saved-searches on eBay and Gumtree

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