HMS Nabbington was Mobile Naval Air Base No.1 and was operational at Royal Australian Air Force base, Nowra, New South Wales.
If you would like a reasonably well documented history of the unit, I understand that your grandfather served with it, please visit my web site dedicated to these forgotten war time units.http://members.madasafish.com/~monabhistory/http://members.madasafish.com/~monabhistory/
What was your grandfather’s rate or rank, what trade was he? Although the unit was tasked to provide mobile airfield facilities, it was a completely self contained unit with its own cooks, stewards, seamen, store men, writers and motor transport pool operated by both Royal Navy and Royal Marine personnel.
Why not put your request for information about your grandfather on the message board available within the web site; it may turn up some old comrades who knew him.
Incidentally, none of these MONAB units saw combat and the only recorded deaths were accidental ones, in the main those who served with these units recall their service fondly and it holds little terror for the majority.