Great idea to build an aftermarket kit to convert any bike, including Brompton's to electric. So good in fact I ordered two kits as we have two very old (1999) Brommies, that we wanted to electrify, so we could get rid of the really heavy electric folding bike my wife has been using, and have one for me. As I ordered early I knew there would be a long lead-time for the kits to arrive, and then Covid happened, hey ho. The first kit arrived recently and I had it fitted in no time, just had to swap the front wheel and tyre, fit the battery pack holder, and pedal sensor, although due to the very narrow space between my crank and bottom bracket I needed a quick call to Swytch Support to fit the sensor disk. Anyway, all fitted and cables tied in and its great! Hardly noticed the hills that used to slow me down. Need a few longer runs now, and the second kit should be arriving in a few days. Very happy!