Hi rossko57, You certainly are tenacious on this one

with no stone unturned, thanks so much!
Have looked at all your comments and links. Have followed through with the
National Archives Navy records and looked again at 1911 census for the final
contender.
1911 revealed that he lived in Barford, Wymondham, Norfolk. Not sure how that
connects to Grays Essex where photo was taken? Occupation was
"payments Royal Navy" In 1901 census he was on Caledonia which Google reveals
was a Naval Base in Rosyth, Scotland.
NA records show he was appointed in 1896 and his rank was Fleet Paymaster.
Maybe the vertical cuff stripes could indicate Assistant Paymaster or Paymaster.
In your opinion could the unidentified uniform be a Royal Navy Paymaster's
uniform? Perhaps the cap had a Tudor crown without other embellishment
because he was in an administrative role?
Could be grasping at straws here.

Regards,
Jen.