This site has end caps for most Bitex hubs:
https://bitexhubs.co.uk/product-category/spares/bitex-hubs-spares/
The guy who does the bitex distribution (that site above) is really helpful if you email him - I broke a bitex axle and he helped figure out which I needed from photos. Thru axle is definitely a huge improvement over qr so worth doing if you can.
@ad441 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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This site has end caps for most Bitex hubs:
https://bitexhubs.co.uk/product-category/spares/bitex-hubs-spares/