My mum, who is 75 and a bona fide holder of a disabled badge, forget to display it on a short visit to as car park and received a ticket for parking in a disabled bay. There was no ticket on the car when she arrived back, and as a consequence she received a demand for full payment of £100 some 3 weeks later. This was backed up by photographic evidence. She would have paid the reduced fee of £50 for her oversight, but obviously could not. I have written to them and they have said the stand fines. In her defence she is forgetful and this was compounded by the fact that her sister had just been admitted to hospital with a collapsed lung. I have been advised to exhaust the appeals procedure and if necessary attend court. Is my advice wise?