HiSorry I took a while to respond, just picked up your message after a long time off-line with a virus :(
Lovely to hear from you.My line is the same as yours but my tree branches at William Horsley (brother of your Mary who married Stephen and co-owner for a while of The Lamb in Melbourne :)
I only have info up to the 3rd generation James (? your gggg grandfather?) Courtesy of Richard Osbourne's wonderful book 'The Horsley's of Melbourne ....' Would love to pick up your tree though, please e.mail me if interested.