Our parking at Warwick last weekend was £1!!
Not helping, @20newnames !!
All my own fault of course, just didn't notice any signs, multi storey was almost empty, and then when I saw pay and display signs at some of the other car parks I allowed DS to persuade me that it would be ok and no need to go back and check.
@Monkey2001 I've told DS that it's coming out of his student loan 
The worst thing was that it's DH's car so he opened the letter and left it on the kitchen counter in a very accusatory manner I thought 
But to be fair he then paid it because there was money off for prompt payment and he didn't trust me to do it quickly enough 