What did it say under view instructions?
As it says apply for set aside it seems likely that you now have a default judgement against you. If you don't pay with 30 days of the judgement date it will be recorded as a CCJ and affect your credit record for 6 years. The other option is to apply to have it set aside - you have to pay for this (£344 I think) - but you also need to show that you have a potential defence. It may be possible to get ParkingEye to agree to a mutual set aside which is much cheaper, maybe on the basis of time passed since original event / non response to you SAR - but don't hold your breath.
The parking cos are pretty sharp on this game once they issue a court claim and stand poised ready to push the default button as soon as they can if the defendant fails to respond!