Will Poulter makes surprise visit to his sister's London classroom

Guardians of the Galaxy actor Will Poulter has paid a surprise visit to a school classroom for Thank a Teacher Day.

The children's teaching assistant is his younger sister Charlie, who he described as an unsung hero for her work. "She cares deeply about this job," he said.

"I am so proud of you" he told her, as he gave her a big hug.