His family described him as the "kindest, coolest, most patient and loving father".

In a statement on behalf of the family, his son Peter said:

He always put family before self. He looked forward to any chance to connect with his grandchildren and had a unique bond with each of them.

He and his youngest grandson,

Whit, could often be found in the corner of a room at family parties having deep philosophical conversations

McCallum's voice was also synonymous with Cartoon Network's series Ben 10.

He went on to appear in the movies The Greatest Story Ever Told, Mosquito Squadron, Billy Budd, Freud and A Night to Remember.

After leaving the army he attended the Royal Academy of Dramatic Art in London where Joan Collins was a classmate.

"But as much as his fans may have loved him, those who worked side by side with David loved him that much more.