First Parking Ticket

Basically received my first parking ticket today. I parked in a gym car park that my uncle is a member of (he came with me) and we left to go get drinks before going to gym. Came back to find a parking charge notice given by CPS (COMBINED PARKING SOLUTIONS). The fine is £60 if paid within 14 days or £100 if paid after that. I believe its unfair I was given the ticket because we are members of the gym and we were going to go after getting our drinks. The gym allows members to park in their car park so I don't see what we did wrong. I'm not 100% sure if you need to register your car with the gym to be able to park there but I have a few friends and family that have parked there over the years and nothing has happened ( they haven't registered their vehicles either).

I've read on a lot of sites that I don't need to pay this as its not enforceable and I should just ignore it etc but can I have some real advice please. I know this company is part of the IPC so it makes it more difficult to appeal/ignore?
Any help would be appreciated, thanks.

Basically received my first parking ticket today. I parked in a gym car park that my uncle is a member of (he came with me) and we left to go get drinks before going to gym. Came back to find a parking charge notice given by CPS (COMBINED PARKING SOLUTIONS). The fine is £60 if paid within 14 days or £100 if paid after that. I believe its unfair I was given the ticket because we are members of the gym and we were going to go after getting our drinks. The gym allows members to park in their car park so I don't see what we did wrong. I'm not 100% sure if you need to register your car with the gym to be able to park there but I have a few friends and family that have parked there over the years and nothing has happened ( they haven't registered their vehicles either).

I've read on a lot of sites that I don't need to pay this as its not enforceable and I should just ignore it etc but can I have some real advice please. I know this company is part of the IPC so it makes it more difficult to appeal/ignore?
Any help would be appreciated, thanks.

Called the gym and they said it would have been fine if you parked in our spaces?? I thought they owned the whole thing and my friends have parked in the same area before as well.. They even said that they tell everyone that joins how the parking system works etc and there's a max stay of 3 hours and you have to sign your car in.... Well they never told me and I asked some friends if they went through that process with them and they didn't. In the end the gym said to phone up the COMPANY(CPS) as they issued it. I called them and after explaining what happened the really helpful guy was like yeah, if you read part 2 on the back of the ticket it says you need to write a letter and appeal, you can't do it over the phone. Now what....

^^^

Well most people say don't contact them and just wait then other say contact and try get them to drop it so I'm kinda stuck...