Hi, strange as it may seem I live in Australia and was surfing around and saw your query about the Jelley family of Gumley. You may already know this information but thought I would tell you what I know in case it helps with your search, even though your enquiry was posted some time ago.
Pop Jelley (I never knew her first name) is still living in the Keeper's cottage in Gumley. She is 90 years old now and is the Aunt of my own Aunt, Helen Norman from Leicester. As a kid I used to go to Gumley to visit Pop who was then the gamekeeper (the only female gamekeeper in Britain at one stage) and her mother Nellie who has long since past away. Pop was also the kennel master for the fox hounds and we used to love to go and see the dogs. I also remember walking through the woods and Pop showing us the badger trails. I last saw them myself in the 1970's when I went back to the UK on a working holiday. My mother has just returned from a visit to the UK and went with my Aunt Helen to visit Pop. She obviously married a Jelley but I don't know what happened to him. They had a daughter called Barrie (another female with a male name). Barrie lives in Holland with her husband. Pop still does all her own gardening at the cottage and seems to be in fine fettle for her age. None of this is probably new to you but thought I would send it just in case.
Lesley Willott (South Australia)