Meryl Streep as Margaret Thatcher

Anthony Stewart Head as Geoffrey Howe

Harry Lloyd as Young Denis Thatcher

Jim Broadbent as Denis Thatcher

Susan Brown as June

Alice da Cunha as Cleaner

Phoebe Waller-Bridge as Susie

Iain Glen as Alfred Roberts

Alexandra Roach as Young Margaret Thatcher

Victoria Bewick as Muriel Roberts

Olivia Colman as Carol Thatcher

Eloise Webb as Young Carol

Sylvestra Le Touzel as Hostess 1949

Michael Culkin as Host 1949

Michael Cochrane as William

Nicholas Farrell as Airey Neave

John Sessions as Edward Heath

David Westhead as Shadow Minister

Julian Wadham as Francis Pym

Richard E. Grant as Michael Heseltine

Roger Allam as Gordon Reece

Stephen Boxer as Cabinet Ministers

Simon Chandler as Cabinet Ministers

Michael Pennington as Michael Foot

Andrew Havill as Cabinet Ministers

Matthew Marsh as Alexander Haig

Nicholas Jones as Admiral Leach

David Rintoul as Admiral Fieldhouse

Pip Torrens as Ian Gilmour

Michael Maloney as Doctor

Robert Portal as Grey Suited Guest 1949

Angela Curran as Crawfie

David Cann as TV Interviewer

Rupert Vansittart as Cabinet Minister

Stephanie Jacob as Female Guest 1949

Martin Wimbush as Cabinet Ministers

Clifford Rose as James R

Jeremy Clyde as James T

Richard Syms as House of Commons Speaker

Robin Kermode as John Major - Cabinet Minister

Michael Elwyn as Cabinet Ministers

Jeremy Child as Cabinet Ministers