Meet the cast of Decline and Fall

Who does he play? A member of Oxford's Bollinger Club, the ultra-privileged Sir Alistair Digby-Vane-Trumpington leads the pack of rich students who strip Pennyfeather naked in the quad and get him kicked out of university. Of course, Digby-Vane-Trumpington himself receives nothing more than a fine after his rampage through Scone College. However, this isn't the last we'll see of this unpleasant character...

Where have I seen him before? If he sounds familiar, that might be because Tom Stourton voices Thomas the Tank Engine characters Rex and Duncan. If he looks familiar, that might be from his roles in About Time, Siblings or Murder in Successville.

Martyn Ellis – Sir Humphrey Maltravers

Who does he play? Indiscrete and gluttonous Cabinet Minister Sir Humphrey Maltravers attends Margot's party, but is very disappointed to find the host is in hiding as he's keen on marrying her.

Where have I seen him before? Martyn Ellis' credits include The Sarah Jane Adventures, The New Adventures of Robin Hood, and Jonathan Strange & Mr Norrell.

Jason Watkins – Wilfred Lucas-Dockery

Who does he play? Sir Wilfred Lucas-Dockery is the Governor of Blackstone Jail, where Pennyfeather ends up through after a series of unfortunate developments. He sees himself as an enlightened innovator, determined to reform his prisoners and try out new techniques in the prison.

Where have I seen him before? Jason Watkins also stars in Line of Duty, where he plays Tim Ifield. He was Solomon Coop in Taboo and Simon Harwood in W1A.

Three-part drama Decline and Fall began on Friday 31st March at 9pm on BBC1