This SV650 flat tracker has been on the British race scene for years. Peter Boast built it, commissioning the frame from Roger Cottrall, fitting a fuel-injected 2005 Suzuki motor... He own loads of races on it. Since then it's had a couple of owners before ending up with the current owner.
We featured it in Sideburn 6.
It's up for £3500 or offers. Go to Suzuki SV650 framer. The seller says it needs 'very little work' to make it into a road bike. It would be possible but I'd take that with a pinch of salt.
Thanks to Kev for the tip-off.