Hi,
Survey images from 2015 show a sign "Nottingham Castle Marina", but the "Castle " is in a different font so I guess it could have been missed at a distance.

I've updated the name and contact:website as the business seems to have been bought out and given a slight rebrand as you've noted:
https://www.openstreetmap.org/way/16514126/

I'm therefore closing the comment as the way now seems up to date (imagery only shows boats moving).
Happy Mapping,

James