Went out today and met a friend for lunch.
I told them where they car park was and said I thought it was free on Sunday. We met up and I checked the parking blurb and, probably because I had in my head it was free on Sunday, I missed the bit where it said the Sunday charging hours underneath the Monday to Friday hours. 
Told friend it was defo free.
We came back to tickets. £25 each if we pay soon.
I apologised and referred back to a conversation we had had at lunch about having to admit I needed reading glasses. I then said lunch on me next time.
I'm feeling so guilty though. If you were me would you offer to pay?
Thing is, this month is really tight and my own fine has to go on credit card. My lunch was toast and the free water. But that's not an excuse, I could pay it on my credit card for friend or defer till payday and pay them back...
Or would you be like my DP who says they should've checked the sign themselves?!