According to D. B. Silver: [Carleton, Hugh Francis - Biography, (from the Dictionary of New Zealand Biography. Te Ara - the Encyclopedia of New Zealand)]: Hugh Carleton returned to England in 1878 and died at his home in Lewisham, London in 1890.
There have been possible associations of Lydia Carleton teaching the Yorke and Joyce children in the stone shed during the 1880s. Is this likely to have happened, given that Lydia would most likely have left with her husband to travel to England? Or had they separated for some reason?
Nothing can be found to support either hypothesis, other than a reference in A Book in the Hand: Essays on the History of the Book in New Zealand: Three: Tampering with the sacred text: The second edition of the Māori Bible by Peter Lineham, pages 33-34. "More work was done by Henry Williams's daughter Mrs Lydia Jane Carleton in England. She found that the last-minute textual changes had led to many inaccuracies." This places Lydia Carleton in England in 1887.
Given that it is recorded that Lydia died at Napier in 1891; she must have returned to live in the Te Aute area, (where her brother Samuel Williams had provided for Williams family members), at some time prior to that. It is most likely that she did this after Hugh died in London.