11 minutes over parking limit, is it worth appealing?

I received a letter today showing I was 11 minutes over the allocated time at a car park (so 1 minute if you include the grace period). I had a friends mother in the car who was on crutches at the time but I'm not sure if that would affect anything. Is it worth me appealing this or shall I just pay it? It's £100 or £60 if I pay within 14 days.