The whole point of the out of hours is so that it is literially out of hours with no bugger about. You don't need to pay 700 odd quid. Thats only for getting an extenstion to the hours of operation which are required when you need a fire cat to operate commercially.
The way Hial work it is that you get PPR as per usual and tell them you be coming in out of hours they say ok. Then you phone them up the next day with your arrival time. If your not on the list of airframes thats submitted your form you won't get PPR.
And you can only use it during day time.
You will have to ask them how to get out of the airfield and how to get back in if required.