Mary Berners-Lee
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Mary Berners-Lee: An unlikely fraud victim

4 June 2014 Last updated at 00:06 BST

Courier fraud is a highly complex telephone scam that police believe to be among the most sophisticated they have ever had to face - and it is on the rise.

As crime victims go, a 90-year-old pensioner might appear typical.

But Mary Berners-Lee is a highly regarded mathematician who helped create the world's first commercial computer, the Ferranti Mark I. She is also the mother of Tim Berners-Lee, the man who invented the world wide web. Yet even she was outsmarted by the courier scammers.

Here, she tells BBC Watchdog how she fell victim to the scammers.