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Dame Stephanie Shirley: Why I give

15 October 2012 Last updated at 00:25 BST

After fleeing to the UK at the age of five to escape Nazi Europe, Dame Stephanie "Steve" Shirley went on to become a successful entrepreneur.

She founded her own software company and built a fortune of about £150m, most of which she has given away to good causes.

At Prior's Court School, an independent special school for students with autism that Dame Stephanie set up, she explains the reasons for her philanthropy.