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Page last updated at 10:51 GMT, Monday, 1 June 2009 11:51 UK

On a stakeout with a private detective

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Investigating the hidden world of surveillance, Richard Bilton goes on the road with a private detective as he tracks a man suspected of having an affair.

For more information about surveillance visit the Who's Watching You website.

The three part series Who's Watching You continues on Monday 1 June, 2009 at 2100 BST on BBC Two.

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