Thanks for your replies....
I have been making phone calls.
First to Lease company who told me to speak to TFL, then to TFL who said as it was the lease company who paid the PCN I can't challenge it without the lease company writing to them to deal with me.
I asked hypothetically whether the charges could be challenged and they seemed to think they could....
So back to the lease company, and they are passing it to their claims team, so it is a waiting game.....
I have tried to pay any current charges for this weekend gone, but ironically the TFL website won't let me as it is exempt
I suppose, at least I haven't hit a "Computer says nah" scenario........yet
Finally, yes I put a private plate on about 6 weeks before, in cooperation with the Lease company, so I suspect TFL's db takes a while to update
Bumper