From TARDIS Index File, the free Doctor Who reference.

Sir Charles Grover was a strongly pro-environmentalist politician and the author of Last Chance for Man. He was made the Minister with Special Powers when dinosaurs began appearing in London. He was secretly the head of Operation Golden Age, and sabotaged the Doctor's and UNIT's efforts to resolve the crisis. When he was exposed, he activated Professor Whitaker's time machine, sending them to an unknown point in the past. (DW: Invasion of the Dinosaurs)