Can you post the original PCN?
If you don’t have it, can you get it, eg a Subject Access Request to the parking company, UKCPS?
Video is pretty meaningless, by the way, how do they know who it is?
In order to construct a defence, we need to know more than just the Particulars of Claim, which are the usual rubbish from Moorside.
If you file an Acknowledgement of Service by 3 June you have until 17 June to file your defence.