I won't comment on the dangerous driving (undertaking at a speed, passing that van on a bus lane when approaching a traffic light), that would be material for The Flame Pit section.
Regarding the PCN.
https://maps.app.goo.gl/dAkXc1vRMZiwnSKR8I saw the images provided, the PCN and the photo/video evidence.
The evidence provided by the authority (photos and the video) do not show any upright 958 warning sign or 959B signage allegedly passed and in place.
I believe the served PCN omits some of the statutory grounds of appeal outlined in Regulation 5(4) of The Civil Enforcement of Road Traffic Contraventions (Representations and Appeals) (England) Regulations 2022.
Not an expert here, just my point of view as an amateur, so better wait for further replies from the senior members of this forum.