Hello me again.
First, it is not a bus lane but a bus gate.
Their website grounds:
Moving Traffic reasons
The following reasons relate to moving traffic contraventions
Select a reason:
There was no contravention of a prescribed order or failure to comply with an indication
I was not the owner of the vehicle
My vehicle was stolen / taken without my consent
The vehicle was on hire to someone else
The penalty charge exceeded the amount applicable in the circumstances of the case
A friend / family member recently passed away
I am a Blue Badge holder
I did not realise I was in contravention
I have already paid the PCN
I performed the contravention due to my medical condition
I performed the contravention to avoid congestion
I was avoiding an accident
I was following a diversion
I was following my sat-nav / I was lost / I'm not from the area
I was making way for an emergency vehicle
I was not at the location on the day
I was not the driver
I was unaware of the rules
I was unaware that a PCN had been issued as I've been away
My vehicle had broken down
My vehicle is a taxi / private hire vehicle
My vehicle was cloned
The owner of the vehicle has passed away
None of the above
If none of the above reasons apply, and you wish to challenge your PCN, please select below:
Select a reason:
Any other reason
*****
I would simply write at this stage that the sign was not visible. Keep it simple. (To me, it also looks twisted a little and is very high up. And the legend on the road is not clear as it is faded.) As ever, happy to do this one for you.