FILMING for biopic Churchill was underway today in Glasgow.

The street outside Glasgow City Chambers was filled with extras in period costume and old vehicles from the 1940's as they filmed exterior shots with Brian Cox.

READ MORE: Brian Cox as Winston Churchill: first image as filming commences in Scotland

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Cox plays the wartime Prime Minister in Churchill, in a war film set in 1944, in the 48 hours leading to D Day.

The actor said it was the "role of a lifetime" in a film being shot "across Scotland".

Cox previously said of the role: "I am looking forward to bringing this iconic but complex figure to life- it’s the role of a lifetime for me and I’m so pleased to be taking this journey with both Jonathan and our great cast."

Made by Salon Pictures, the film sees the "wartime leader clash with his generals, tension builds with the Americans, and Churchill must wrestle his inner-demons in order to navigate the Allies to victory."

READ MORE: Brian Cox as Winston Churchill: first image as filming commences in Scotland

It is being directed by Jonathan Teplitzky and has been written by British historian and author Alex von Tunzelmann in her feature debut,