You can just pick up the phone, or pop in and have a chat with them before you submit anything. That way you know what you’re submitting is OK and they know what it is etc.
yeah, we did all that. Went down their offices and everything, drew diagrams for them, showed them plans, the works. Then some little jumped up council official turned up at the house, told my wife he saw no reason why people should be able to extend their houses, he after all, lived in a two bedroomed house quite happily and that he was going to block the request.
What the architect did (in reality) was exhibit a much better understanding of the regulations than the builder or the council, angled a corner of one of the walls of the conservatory which changed an intersection at a boundary wall and it all went through fine. Worth his weight in gold IME.