Meryl Streep as Margaret Thatcher

Jim Broadbent as Denis Thatcher

Olivia Colman as Carol Thatcher

Roger Allam as Gordon Reece

Susan Brown as June

Nick Dunning as Jim Prior

Nicholas Farrell as Airey Neave

Iain Glen as Alfred Roberts

Richard E. Grant as Michael Heseltine

Anthony Stewart Head as Geoffrey Howe

Harry Lloyd as Young Denis Thatcher

Michael Maloney as Doctor

Michael Pennington as Michael Foot

Alexandra Roach as Young Margaret Thatcher

Amanda Root as Amanda

Pip Torrens as Ian Gilmour

Julian Wadham as Francis Pym

David Westhead as Shadow Minister

Angus Wright as John Nott

Alice da Cunha as Cleaner

Phoebe Waller-Bridge as Susie

Victoria Bewick as Muriel Roberts

Emma Dewhurst as Beatrice Roberts

Sylvestra Le Touzel as Hostess 1949

Michael Culkin as Host 1949

Stephanie Jacob as Female Guest 1949

Robert Portal as Grey Suited Guest 1949

Richard Dixon as Male Guest - 1949

Clifford Rose as James R

Michael Cochrane as William

Jeremy Clyde as James T

Michael Simkins as Peter

Eloise Webb as Young Carol

Alexander Beardsley as Young Mark

John Sessions as Edward Heath

Richard Syms as House of Commons Speaker

John Harding as Cabinet Minister

Simon Chandler as Cabinet Minister

Stephen Boxer as Cabinet Minister

Jasper Jacob as Cabinet Minister

Rupert Vansittart as Cabinet Minister

Robin Kermode as John Major - Cabinet Minister

Andrew Havill as Cabinet Minister

Michael Elwyn as Cabinet Minister

Peter Pacey as Cabinet Minister

Jeremy Child as Cabinet Minister

James Smith as Lord Carrington - Cabinet Minister

Hugh Ross as Cabinet Minister

Chris Campbell as Cabinet Minister

Paul Bentley as Douglas Hurd - Cabinet Minister

Martin Wimbush as Cabinet Minister

Simon Slater as Cabinet Minister

David Cann as TV Interviewer

Christopher Luscombe as Voice Coach

Angela Curran as Crawfie

David Rintoul as Admiral Fieldhouse

Nicholas Jones as Admiral Leach

Richard Goulding as Naval Attaché

Matthew Marsh as Alexander Haig

Willie Jonah as Kenneth Kaunda