Thomas Thatcher was born in 1848 and emigrated to New Zealand in 1878. He founded Atlas Preservatives, originally a sheep dip and weed killer manufacturer. His son Thomas Herbert Thatcher was born in New Zealand in 1885 and married Lilian Kathleen Bird, a secretary at Atlas. Their son was Denis Thatcher.
Thatcher Street in Castlecliff is named after Thomas Thatcher and Thomas Herbert attended Wanganu Collegiate from 1894 to 1897, when they moved back to England.