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Michael Gambon
John Harrison

Jeremy Irons
Rupert Gould

Ian Hart
William Harrison (Adult)

Andrew Scott
John Campbell

Bill Nighy
Lord Sandwich

Gemma Jones
Elizabeth Harrison

John Wood
Sir Edmund Halley

Anna Chancellor
Muriel Gould

Brian Cox
Lord Morton

Samuel West
Nevil Maskelyne

Ian McNeice
Dr. Bliss

Jonathan Coy
Adm. Sir Cloudsley Shovell

Christopher Hodsol
Capt. Ainsley

Liam Jennings
William Harrison (Young)

Peter Vaughan
George Graham

Nigel Davenport
Sir Charles Pelham