OK, here goes:
I was travelling along the road inside a Bus Lane that has operational hours of 7-10am & 4-7pm Mon-Fri. That Bus Lane ends and the lane goes back to normal - as in, all traffic can use it all the time.
As I travelled around the bend in the road, I found myself in a new Bus Lane which operates At All Hours, but the sign is only visible once you are already in the Bus Lane. The Bus Lane itself is very short - maybe the length of a bus - and there is no way to safely move into the adjacent lane without causing issues to other traffic. After the very short section of bus lane, the road returns to all traffic.
It seems odd that there is a very long stretch of bus lane that operates within given hours and even then only Mon-Fri, and then a very short section of bus lane which operates at all hours after the original bus lane has ended. This is made worse by the fact that the bus lane sign cannot be seen until you are already in the bus lane, thereby making it too late and dangerous to move out of the prohibited section. In fact, the sign is confusing as it can be interpreted that it refers to the bus lane that has already ended in the original lane.
I therefore challenge the PCN on the basis of incorrect and insufficient signage.
Please let me know if I'm on the right lines!
Thanks