The Tory peer says he is sorry to be fired by the PM, but tells Sky News the Lords is right to ask the Commons to "think again".
Nicola Urquhart says it is "torture" waiting for news as police describe the search of a landfill as "the next logical step".
The driver of the vehicle, a man in his 80s, was arrested on suspicion of causing death by dangerous driving.
Marcus Martin has been charged with a string of offences in Queensland - including multiple counts of rape and assault.