Emotive for you maybe. The exemption exists nevertheless..........and...........my point is that claiming you were on private land when a 3rd party injury accident happened will not wash if you were not on private land. It is surely clear that any such incident that then resulted in police investigation would be very clear where the incident happened. So the fact you can ride a desrestricted pedelec legally on private land is not a get out of jail free card.
I know this is an emotive subject and personally, I could not care less what people chose to do to their bikes, but it is surely worth them knowing the risks.
Bloke buys a derestriction kit off an lbs, crashes, the cops turn up at the lbs who say the bloke promised it was for use on private land only. If they're cute, they'd have a signed chit saying so too.
Bloke on the hook, lbs not so much. Your original assertion that the lbs would be complicit in committing an offence is pony.