All sorted. I faxed NYH late last night with a cover letter letter, detailing my current booking, and that I'd been advised by the UK Reservation team
rolleyes1 - in reality I'm sure that it did come up on an earlier conversation with them) that on arrival I could add the extra people to the room.
Outlined how many people I wanted to add, along with their ages. Explained that these extra people only need to be added on a 'Bed and Breakfast' basis as they had valid APs.
Also was clear that it was my expectation/understanding that this could be done for a nomimal fee.
Anyhow, had an email this morning (very prompt) from the DLP UK Admin team. They'd been passed the fax (apparently NYH don't deal with reservations). They've confirmed that the three extra people will be able to share my room, and that this will cost my (payable at reception) an extra 1.65 per person per night.
Result!....although I will be taking a copy of the email with me...just in case...
Regards
Iain.