Thank you for the several (very prompt!) replies. Yes, there's lots of Info about George after 1851 and I have collected a pretty good outline of his life from various records.
He had two marriages (one in Nottingham and one in Cork) on both certs he gives his father's name as Boyfield Garfoot. His YoB is taken from census reports. Can't find him in the 1841 census, but he was imprisoned in Lincolnshire for 5 months in 1946.
I've not been able to trace my mother's side of the family back any further than 1946. My gggrandmother was his second wife. I have details of their marriage, but not of her parents. My ggrandmother (Lydia) was born in Malta.
I looked through the parish records about 4 years ago when I was visiting Nottingham, but couldn't find George or Boyfield. I was wondering if getting a copy of his death cert might help, but you answered my question (thank you Rosie), clearly the answer is no!