If you want to take them to London Tribunals to appeal the matter, then you have to wait for the Enforcement Notice, appeal that and be rejected, then you can register an appeal at LT.
I suggest you "mug-up" on the LLA Act 1996, in the parts relating to bus lanes and especially Schedule 1 which deals with Enforcement Notices.
https://www.legislation.gov.uk/ukla/1996/9/schedule/1/enacted
Read especially, the paragraph headed Admissibility of certain evidence in the section 7 (1) et seq,
Yeah, I spoke to the driver and he agreed to pay this one. He had no reason to be in the bus lane. It was really indefensible. I thought maybe the HGVs coming the opposite way (as seen in the video I cant share) were possibly encroaching on our vehicles side of the road as there is cars parked on the opposite side. But looking on GSV there is still plenty of room, and if our vehicle was giving them a wide birth, it was by all means, unnecessarily wide.
Whislt it's possible the video doesn't show the vehicle going past upright signage or some other failure in evidence of the contravention. But it was grasping at straws I think.
And I came to the conclusion the PCN itself was in check. I made the mistake of trusting the word of AI initially which sent me down a rabbit hole. Essentially the notice would not be compliant with the original 1996 order but is with the amended version. But damn AI is not just wrong, it is sooo convincingly wrong sometimes it's concerning. The ultimate propaganda machine.