Thanks for that, I was foolishly focusing my search on the frame rather than the cranks.
Most welcome. Well, the bottom bracket still has to fit the frame (BSA/68mm), so you weren't wrong.
@Tijs started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Thanks for that, I was foolishly focusing my search on the frame rather than the cranks.