To repeat what others have said.
While we may all assume that you stopped because of traffic, the video does not show that.
For all anyone knows, you stopped due to uncontrollable sneezing or the band of the Scots Guards crossing the road or a troupe of performing Just Stop Oil.
To be very clear, you can stop and have a picnic without breaking the rules on YBJs.
Without evidence of stopping due to stationary traffic the contravention cannot be upheld.
Dear sirs
Ref PCN

?
I have reviewed your video evidence and fail to see that it shows the reason for what can only be described as minimal intrusion into the yellow box.
The law is clear in that a driver may not enter and stop in a yellow box due to the presence of stationary vehicles.
Your video fails to show stationary vehicles causing the stop.
Without this critical condition, enforcement of this PCN is flawed and cannot be sustained.
Many thanks in anticipation of your cancellation.
Hugs and Kisses.
Tis all that is needed