Suggestions by @cosmolover

Adrian Scarborough

as Mervyn Bunter in Have His Carcase

Score: +1

Claire Foy

as Harriet Vane in Have His Carcase

Score: -1

Toby Stephens

as Lord Peter Wimsey in Have His Carcase

Score: +1

Penelope Keith

as Lady Dormer in The Unpleasantness at the Bellona Club

Score: +1

Jonathan Cake

as Major Robert Fentiman in The Unpleasantness at the Bellona Club

Score: +1

Tom Burke

as Captain George Fentiman in The Unpleasantness at the Bellona Club

Score: +1

Anna Maxwell Martin

as Ann Dorland in The Unpleasantness at the Bellona Club

Score: -1

John Heffernan

as Dr Penberthy in The Unpleasantness at the Bellona Club

Score: +1

Pip Torrens

as Colonel Marchbanks in The Unpleasantness at the Bellona Club

Score: +1

Sophie Winkleman

as Sheila Fentiman in The Unpleasantness at the Bellona Club

Score: -1

Ben Miles

as Captain Culyer in The Unpleasantness at the Bellona Club

Score: +1

Daniela Denby-Ashe

as Sheila Fentiman in The Unpleasantness at the Bellona Club

Score: -1

Michael Cochrane

as Woodward in The Unpleasantness at the Bellona Club

Score: +1

Jeremy Northam

as Mr Murbles in The Unpleasantness at the Bellona Club

Score: +1

Joseph Kloska

as Mervyn Bunter in The Unpleasantness at the Bellona Club

Score: +1

Adrian Scarborough

as Mervyn Bunter in The Unpleasantness at the Bellona Club

Score: +1

Toby Stephens

as Lord Peter Wimsey in The Unpleasantness at the Bellona Club

Score: +1

Samuel West

as Norman Urquhart in Strong Poison

Score: +1

Andrew Scott

as Denis Cathcart in Clouds of Witness

Score: +1

Perry Fitzpatrick

as Philip Boyes in Strong Poison

Score: +2