IN a week during which the Conservative Party has been urged to hand back millions of pounds in donations from a prominent donor, the most senior government figures set to appear on the BBC's flagship Sunday morning is Transport Secretary Mark Harper. 

He will be interviewed by Laura Kuenssberg and a panel will give their reactions to the conversation and the biggest political stories of the week. 

But who else is set to appear on the programme? 

Labour MP and shadow paymaster general Jonathan Ashworth will be on the show, where he is likely to be asked about whether Diane Abbott should have the Labour whip restored following racist comments directed at her by Tory donor Frank Hester. 

Former Labour Party deputy leader Harriet Harman will also join her colleague. 

The brother of Princess Diana, Earl Charles Spencer, will be on the show to discuss the abuse he suffered at the hands of his headmaster as a child. 

Furthermore, businessman and Dragon's Den star Theo Paphitis will feature as well as former Conservative Party adviser Samuel Kasumu.