Looking at the photograph, it is not a fine, but a parking charge notice.
He has two options: (1) pay it, or (2) fight it (using the information that can be found by searching on here, on pepipoo or on MoneySavingExpert).
I would strongly suggest that he does not ignore it (although doubtless somebody will come along with some out-of-date, incorrect information suggesting that they have ignored one of these in the past and didn't come to any harm).