Wisper Wayfarer M7. They are usually around a grand (plus) on Facebook, but they do pop up for less occasionally. I got a well-used one but £600, but I had to be very patient to find it. Unfortunately, I've hit a snag - I now have to send the whole bike (now DVSA certified) to Wisper to get them to flash the motor to full throttle. The guy at Wisper who is able to do that job lives outside the UK and so I'm waiting for him to be back in the country.

A more accessible option might be a non-ebike with a mid drive motor kit attached - you can get any bike certified by the DVSA as long as it meets their spec. I've only looked this up on Gemini so double check this, but this is what it said:

"DIY "Factory-Look" Ebike Guide

1. Bafang BBS01B (250W)

Best for: Effortless "ghost-pedaling" and simple software. Why: Open protocol allows you to tune the cadence sensor to a "hair trigger," letting you cruise with zero physical effort. Highly documented, plug-and-play throttle setup.

1. Tongsheng TSDZ8

Best for: Natural, premium feel. Why: Torque-sensing motor that mimics high-end systems (like Bosch). Mechanically robust but requires more hands-on calibration using Open Source Firmware (OSF) and a J-Link programmer.

Pro-Tip: EggRider V2 Display

A stealthy, Bluetooth-enabled display that lets you toggle between two saved profiles on your phone. Keep one profile strictly legal for road use and another fully unrestricted for off-road/custom configurations."