It was in yesterdays Advertiser Pete.It's not important enough to get in the web version for some reason,i can't find it there today either.
They seem to run the "main" car park on a day by day basis,opening and closing when they can be arsed too.It did say that you got a reduction at the museum with it,but thats no good if you get in for free anyway or if you don't want to go in (again).
I use it when i can't get in at the Post office.Parking at the pay and display in the Red Lion is ok if you are going in there,but i do my best not to park there,they make enough out of us as it is!