https://www.paulmilnescycles.com/forme-calver-jr-pro-cross-disc-alloy-frame-carbon-fork-bolt-through-38cm-700c-4702-p.asp
Also Hup do a good small cx bike/frame
https://kidsracing.co.uk/collections/cyclocross-bikes-700c-low-standover/products/self-build-bundle-hup-evo-drop-bar
Excited about that self-build CX job, just specced one up, looks like the best way to a nicely specced bike.
@Stevethecoffee 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.
https://www.paulmilnescycles.com/forme-calver-jr-pro-cross-disc-alloy-frame-carbon-fork-bolt-through-38cm-700c-4702-p.asp
Also Hup do a good small cx bike/frame
https://kidsracing.co.uk/collections/cyclocross-bikes-700c-low-standover/products/self-build-bundle-hup-evo-drop-bar