Limit parking fines to no more than £10 per hour or similar

If someone overstays their parking limit, for example a 2 hour limit in a supermarket care park, they may have had a meal and be elderly and slow at getting around, they could be £50 fine. This is excessive and should be regulated, based on per hour. The government should regulate to ensure fines are not excessive and be based on how long over the limit was involved. This would help the general population.