Gerry
I just saw your post pop up.
I was doing a bit of work on Admiral Essington about a year ago and by coincidence was just looking at it again in the last couple of weeks.
In the meantime I had found that a really fine portrait of Essington had sold at Christie's back in 2004.

This page on Christie's website shows the portrait and some biographical info.
http://www.christies.com/LotFinder/lot_ ... ID=4233626As you will see - his real claim to fame was captaining HMS Triumph at the Battle of Camperdown for which he was awarded the Naval Gold Medal.
My understanding is that he died childless. I have a copy of his will here but the copy is very poor and consequently very hard to read. But I seem to recall that the beneficiaries were firstly his wife but also a cousin. As soon as time allows I will pore over the will again and see if I can make more sense of it.
I know that his father had also been in the navy - reaching the rank of Lieutenant.
After Admiral Essington's death his wife ended up living in a suburb of Birmingham. A street was named after her - Essington Street - which disappeared in the 1960's/70's redevelopments. But I believe that the name has been revived so there is again an Essington Street - just off Broad Street.
Essington had died in London and there was a memorial to him in Wandsworth Parish Church - possibly it is still there.
That's a bit to be going on with.
Meanwhile - what were the dates of your gggrandfather?
Admiral Essington died in 1816 so would be interesting to see how the dates might tie in.
MB