I will get the pics soon ... thanks for replying

Hi All Recently I went to a pub in stockley park, west london. I have been going there since ever i guess, and parking here is free Now this last time, when i came back to my car, there was a Parking change notice stuck in my car wiper, not pasted. It said, The vehicle was parked outside the markings of parking bay. I parked between two cars and that was the only way I could have done that coz car on my right was out of its bay as well. but i got £100 PCN reduced to £60 if paid in 14 days.. now am confused, should i appeal or just ignore these ppl ? the sinages I must say are not that visible and i always thought its a free car park. which it is.. but i didnot know parking on bay line was not allowed. what options do i have now ? this is so bizarre that parking is free but they are making their money like this !!