According to a New Zealand BMD search he died 2018.
He was the son of Saxon George Manners TOLLEMACHE (1904 - 1974), scion of the DYSART earls, TOLLEMACHE baronets, etc. (in remainder to both these titles, being descended from William, Lord Huntingtower [1766 - 1833]) and Ruth Bell WAYNE (died 1975)
He m 1971 Catherine Mary JACK, and with her had issue: 1 son (who is m, but no issue shown in Debrett's online)