Thank you MJ it's my pleasure.
I read that your GG Grandfather was drafted three times to HMS Excellent which is a Shore Establishment in Portsmouth. Still there today. It is a Gunnery School of the highest level and ''takes no prisoners'', as the saying goes, not even dead ones. Your ancestor was a Leading Seaman, and a Gunnery Rating in 1884 and of course later a clearance diver. The Gunnery Courses he took would certainly be needed as the massive guns in those days sported 18'' MK Naval Guns on board these massive ships.
The first course he took was the 14th Feb 1884, others were 1888 and 1891. His pay would increase greatly and with the Divers course taken put him in a comfortable position, but, not too comfortable!!
Strangely, I was at HMS Excellent 80 years after your ancestor was there. I trained as a Gunnery Instructor and did several courses thru' my career in the Royal Navy. Today, there are no big guns, no huge shells, black cordite but now just Sea Cat Missiles, Polaris Missiles and others that hide themselves in submarines. Your ancestor, would be surprised at the least, to see the change from what it was.