Dean
Hello Dean,
I will preface this by saying I am not an AE!
However, I have pulled together some information on the AP Appointment process for PPL Engineering Services, which you can read here if you like.
@perrydixon should be able to assist you with your query from an AE standpoint.
@GPTaylor would also be another good person to talk to from an Electrical standpoint.
I hope that you get the answers you need!
Many thanks
David