In 1969 John, you were awarded the M.B.E. by the Queen for the major part you played in the development of a biological solution to the cactus problem.
Most people today have no idea how bad the actual situation was.
Well the cactus invasion of Australia was probably history's greatest recorded invasion of a country by a plant weed in any part of the world. A single, yellow flowering prickly pear was brought to Australia in 1839. By 1914 it had covered 60 million acres so densely, that it was impossible to do anything of value with the land. Families were driven off their blocks. They had attacked it with everything they had, and any special machinery or chemicals that they could invent.