Hello Alpha
That's fantastic - it's the same Robert Hobbs! We knew he was a gardener (from censuses) but to hear he was a noted horticulturist is something special. Interestingly, Judy's late father (john Anthony Hobbs Bowles) was a very keen gardener - and probably never knew about Robert. Judy and I went only last week to Marlow and Hambleden, to have a look around. We didn't find 'Gardeners Cottage', where Robert lived, but after your message I did check back to the 1871 census and see that he then lived in Mill Lane, right next to Thames Bank.
After returning from our visit, I went online and found all the children of Francis and Ann that you mention. I also found an Eleanor Hobbs, christened in Feb 1816. Maybe she didn't survive?
FYI, Robert was married to Mary (don't know her surname), and their children were Elizabeth, John, Thomas and Alfred. John married Eliza Sawyer (of Great Marlow); they had three children, one of whom was Kate Emma Hobbs. She was born in south-east London, but returned to Marlow to live with her 'Sawyer' grandmother. I'm not sure, but I think her mother died, and her father re-married.
Kate married Thomas Bowles, and they lived in Hambleden a while, before moving to the Acton area of London. (In the church in Hambleden, we found a record of Thomas Bowles, baker). Judy's grandfather, John Hobbs Bowles, was born in Hambleden. Of course I can let you have all the details relating to Robert and his off-spring, but I realise that William is the one of direct interest to you!
We'd be very pleased to know more about Francis. You mention his gfather; was his father by any chance John and his mother Ann? I found a Francis Hobbs, christened in 1873 in Hambleden. And would there be any chance of seeing the gfather's will? Clearly that's a very personal document, so I understand if you want to keep it private.
Thank you again for your interesting and helpful response.
kind regards, glimpse39