Spacers that would fit on the bottom bracket to align the motor flush as required - anyone know a UK source or specification so buddy can order from hardware stockist preferably. They range from 1mm to 4mm thick when bought as a kit from Luna:
https://lunacycle.com/parts/bafang-parts/bbshd-parts/spacer-kit-for-bbshd-bottom-bracket-fitting-4-pieces/
https://lunacycle.com/parts/bafang-parts/bbshd-parts/spacer-kit-for-bbshd-bottom-bracket-fitting-4-pieces/