
Alastair Sim
Alastair George Bell Sim, CBE (9 October 1900 – 19 August 1976) was a Scottish character actor who appeared in a string of classic British films. He is best remembered in the role of Ebenezer Scrooge in the 1951 film Scrooge, and for his portrayal of Miss Fritton, the headmistress in two St. Trinian's films. He was famously described by comedian Ronnie Corbett as a "sad-faced actor, with the voice of a fastidious ghoul", in Corbett's autobiography High Hopes. Description above from the Wikipedia article Alastair Sim, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Filmography

To See Such Fun
To See Such Fun

Rogue Male
as The Earl
Rogue Male
as The Earl

The Littlest Horse Thieves
as Lord Harrogate
The Littlest Horse Thieves
as Lord Harrogate

Royal Flash
as Mr. Greig
Royal Flash
as Mr. Greig
The Prodigal Daughter
as Father Perfect
The Prodigal Daughter
as Father Perfect

The General's Day
The General's Day

The Ruling Class
as Bishop Lampton
The Ruling Class
as Bishop Lampton

A Christmas Carol
as Scrooge (voice)
A Christmas Carol
as Scrooge (voice)

The Millionairess
as Sagamore
The Millionairess
as Sagamore

School for Scoundrels
as S. Potter
School for Scoundrels
as S. Potter

Left Right and Centre
as Lord Wilcot
Left Right and Centre
as Lord Wilcot

The Doctor's Dilemma
as Cutler Walpole
The Doctor's Dilemma
as Cutler Walpole

Blue Murder at St. Trinian's
as Miss Amelia Fritton
Blue Murder at St. Trinian's
as Miss Amelia Fritton

The Green Man
as Hawkins
The Green Man
as Hawkins

Geordie
as The Laird
Geordie
as The Laird
Festival in Edinburgh
as Narrator
Festival in Edinburgh
as Narrator

Escapade
as Dr. Skillingworth
Escapade
as Dr. Skillingworth

The Belles of St Trinian's
as Millicent Fritton / Clarence Fritton
The Belles of St Trinian's
as Millicent Fritton / Clarence Fritton

Innocents in Paris
as Sir Norman Barker
Innocents in Paris
as Sir Norman Barker

Folly to Be Wise
as Capt. William Paris
Folly to Be Wise
as Capt. William Paris

Lady Godiva Rides Again
as Hawtrey Murington (Optimum Films) (uncredited)
Lady Godiva Rides Again
as Hawtrey Murington (Optimum Films) (uncredited)

Laughter in Paradise
as Deniston Russell
Laughter in Paradise
as Deniston Russell

The Happiest Days of Your Life
as Wetherby Pond
The Happiest Days of Your Life
as Wetherby Pond

Stage Fright
as Commodore Gill
Stage Fright
as Commodore Gill

London Belongs to Me
as Mr. Squales
London Belongs to Me
as Mr. Squales

Captain Boycott
as Father McKeogh
Captain Boycott
as Father McKeogh

Hue and Cry
as Felix H. Wilkinson
Hue and Cry
as Felix H. Wilkinson

Green for Danger
as Inspector Cockrill
Green for Danger
as Inspector Cockrill

Waterloo Road
as Dr. Montgomery
Waterloo Road
as Dr. Montgomery

Let the People Sing
as Professor Ernst Kronak
Let the People Sing
as Professor Ernst Kronak

Cottage to Let
as Charles Dimble
Cottage to Let
as Charles Dimble

Law and Disorder
as Samuel Blight
Law and Disorder
as Samuel Blight

The Mysterious Mr. Davis
as Theodore F. Wilcox
The Mysterious Mr. Davis
as Theodore F. Wilcox

Inspector Hornleigh
as Sergeant Bingham
Inspector Hornleigh
as Sergeant Bingham

The Squeaker
as Joshua Collie
The Squeaker
as Joshua Collie

Gangway
as Detective Taggett
Gangway
as Detective Taggett
Strange Experiment
as 'Pop' Lawler
Strange Experiment
as 'Pop' Lawler

The Man in the Mirror
as Interpreter
The Man in the Mirror
as Interpreter
The Big Noise
as Finny
The Big Noise
as Finny

Late Extra
as MacPherson
Late Extra
as MacPherson

The Riverside Murder
as Police Sergeant 'Mac' McKay
The Riverside Murder
as Police Sergeant 'Mac' McKay