I now have birth and death certificates for Uncle George - full name George James Pepper Slator. The Slator is his surname and Pepper is his mother's maiden name and probably his paternal grandfather's surname as well. He was born in Crowland, Lincolnshire on 4th March 1918 and died on 19th June 1926 at home in Dunston - a small village not far from Lincoln - of chronic gastritis and Myocarditis heart failure. There was no post mortem and death was certified by the GP - so presumably it was expected. So all this time I've been cheerfully telling doctors that there has been no one in my immediate family with heart problems under the age of 40 I've actually been wrong!
I would assume though that perhaps he'd been suffering from either or both of those conditions for some time as my father implied he'd always been in poor health. He could perhaps have been Downs Syndrome as I think they often have heart and digestive problems - which could account for why my father was never keen to talk about him. At least I know a bit more about an uncle who was born and died before I was born. Fascinating.
Now I want to try and find out who my great great grandfather's second wife was and what happened to my great grandmother after 1891.