Free Traffic Legal Advice

I received the attached ticket yesterday and I'm a bit annoyed. I'm the registered keeper but not the driver. Having spoken to the driver they inform me that they drove into the area and had an unexpected phone call while parking, about 40mins in length. When they got out to use the services they noticed the parking charges and decided not to park and left. They have offered to pay the fine but it seems a bit excessive to me, any advice greatly received.

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