Eddie Redmayne

James Glaisher

Thomas Arnold

Charles Green

Lewin Lloyd

Charlie

Kamil Lemieszewski

Scientist of Royal Society

Gianni Calchetti

Royal Society Member

Robert Glenister

Ned Chambers

Rebecca Front

Aunt Frances

Anne Reid

Ethel Glaisher

Himesh Patel

John Trew

Vincent Perez

Pierre Rennes

Phoebe Fox

Antonia

Tim McInnerny

Airy

Tom Courtenay

Arthur Glaisher

Felicity Jones

Amelia Rennes

Jason Lines

Street Doctor (uncredited)