thanks ShaunJ, I had another look at the entry on TNA about this and I hadn't realised this was part of a survey return (which explains why the date of the record is 1817!)
I've found him mentioned as a witness on the old bailey webiste as superintentent of the east india dock in september 1818 so I wander if he left the Navy sometime 1817 -1818.
there are some TNA entries from his superoir discussing his trouble with kidney stones and needing to go off active duty so that would fit!
I will look up this record - plans to go to TNA soon !
I have never researched anyone in the Navy before, its very interesting
Thanks again,
Kate