Looks like this Paragon dropout: https://www.paragonmachineworks.com/frame-building-parts/dropouts/dropouts-flat-mount/dr2071-steel-flat-mount-dropout-assembly.html which would take this hanger: https://www.paragonmachineworks.com/b4120-short-2024-hanger-10-mm-skewer-black.html
Can't find a UK stockist, though. But I would think @coldharbour would have them lying around.
Many thanks.
I had naively supposed that a derailleur hanger would be a fairly generic type of component!
I have emailed Isen, will call them.
@ChasnotRobert started
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Looks like this Paragon dropout: https://www.paragonmachineworks.com/frame-building-parts/dropouts/dropouts-flat-mount/dr2071-steel-flat-mount-dropout-assembly.html which would take this hanger: https://www.paragonmachineworks.com/b4120-short-2024-hanger-10-mm-skewer-black.html
Can't find a UK stockist, though. But I would think @coldharbour would have them lying around.