The ADO Air20S is a folding commuter e-bike that swaps the usual chain for a carbon belt drive, so there's nothing to oil and a lot less noise. A 250W motor gives pedal-assist up to the UK's 25 km/h (15.5 mph) limit, and there's no throttle at all, just proper pedal-assist EAPC riding.
At 18.5kg it's light for a folder, with a removable 37V 10Ah battery good for up to 100km, front suspension, hydraulic disc brakes and Bluetooth connection to the ADO app for ride stats and fault alerts. It folds down small enough for a train or car boot, though the single-speed drivetrain means hillier routes take more legwork.