The stop/start bit is interesting.
If the driver stops, car in neutral, handbrake on, the stop/start will shut the engine down - most reasonable people would argue that the engine is now 'off' (it's not running, no fuel is being burned, no emissions are being produced). However, thanks to the wonders of technology, the car can switch the engine back on at any second and without warning, a matter over which the driver has no control.
Is the driver then committing an offence? Presumably technically yes, although they'd be unlucky to find a particularly zealous constable observing them doing so?
Not that any of this matters to me, as my car has one of those incredibly rare working Bluetooth systems