Chris Huhne and Vicky Pryce in second police interviews
Chris Huhne and estranged wife Vicky Pryce have been interviewed for a second time at police stations in Essex over speeding offence allegations.
Essex Police say a file will be prepared and submitted to the Crown Prosecution Service, paving the way for a possible prosecution.
Officers are investigating claims Mr Huhne had asked Ms Pryce to accept penalty points on his behalf.
The Lib Dem energy secretary says the allegations are "simply incorrect".
The pair were interviewed by police last month over the claims he persuaded her to accept a three-point penalty on his behalf in March 2003 so he could avoid a driving ban.
Both Prime Minister David Cameron and his deputy, the Lib Dem leader Nick Clegg, have rejected calls for Mr Huhne to resign.
Mr Huhne and Ms Pryce were questioned after officers obtained a court order to take possession of a tape recording in which the ex-couple apparently discuss the case.
Last month, The Sunday Times reported it had been ordered by a judge at Chelmsford Crown Court to hand the tape - features a conversation between Mr Huhne and Ms Pryce - to Essex Police.
The paper said it was considering an appeal.
Images of Ms Pryce's driving licence have emerged indicating she received points for an offence in the Essex area on the date in question.
But she is thought to have told police she was at an event in London at the time and it was Mr Huhne who was at the wheel.