I'm sorry, you are absolutely right and I was wrong about the date that Lundy was bought by the Heaven family. William Hudson Heaven (not a reverend) bought Lundy in 1836.
William Hudson Heaven was married to Cecilia Jane Grosett, daughter of Admiral Grosett. There was a Rev. William Henry Heaven, b.1826.He was a nephew of William Hudson Heaven, and he married Frances Susan Patteson and is my great grandfather. All the other Williams that I have were born way too late, or too early.There was another Rev. Heaven on the island, the Rev. Hudson Grosett Heaven, who died unmarried.And William Walter Hope Heaven, b. 1829, went to Australia, married Marion Elizabeth Boulton, and died in Australia.She and her children returned to England.
It is possible that someone is unaccounted for, but between Burkes and a very lengthy typed history, I can't find Harriett Mattock anywhere.I do know there were Heavens from another line living in the Portishead area, and as I mentioned before there was a connection, but whoever the connection was it goes way back and no one seems able to find it.