My thoughts on this:
I am challenging the PCN because you have not provided information that allows a diligent motorist to check the single yellow line restriction times. As such the contravention did not occur owing to failure to provide clear information compliant with guidance.
I drove into the zone the evening before and parked in a bay in Branston street to stay overnight at xxxxxx.
I then moved the car to Lionel Street the next day as I wanted to be closer to the city centre.
I checked the restrictions for the parking bay and the zone times on your website and both say the restriction applies 8am-6pm Monday-Saturday and not Sunday. Your website is explicit that these are the operational hours of the Jewellery Quarter controlled parking zone.
There was no reason to suppose the yellow line was not similarly restricted and the only way I could have found out was finding an entry sign I could have passed in the dark the evening before.
You have a duty to avoid confusion among restrictions according to guidance in the Traffic Signs Manual, especially in a large controlled parking zone such as this. Here, the Sunday control, only for the yellow lines, is not stated on your controlled zone website page, and the manual is clear that confusion is likely where parking bays in these zones operate at different times to the CPZ entry as they are often the same.
I look forward to cancellation of the PCN.