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@BigglesZX
Thanks again for the comments, folks. For future readers, Clerkenwell Screws was a fascinating visit but they don't do screws that small, sadly! I ended up first going to a mobile repair shop near here and getting a couple of ex-iPad screws, before then finding someone on Fleabay selling little packs of "Garmin HRM replacement screws" which look a bit different but seem to be fine.
Crucially I also found a different set of screwdrivers with free-spinning little bits on the tops of the drivers, so you can press nice and hard while turning them and avoid stripping the screws in the first place. A+ would recommend.