Vicki,
I'm afraid I haven't recently (although I did work at the Museum one summer in the dim and distant past of the 1970's, and on occasion was allowed into the Caird Library!) I am also a life member of the NMM. However, I'm sure others here have, and they will very likely reply in due course.
As you probably know they have just had a revamp of the museum and library, with the opening of the new Sammy Ofer wing. In the meantime (Greenwich?

) I would suggest perusing their website, where I see they are now marketing themselves as the Royal Museums Greenwich:
http://www.rmg.co.uk/