http://www.theregister.co.uk/2012/02..._for_tfl_data/

"The Metropolitan police has requested Oyster card data relating to citizens
and other personal information from Transport for London (TfL) more than 22,000
times since 2008"

And if anyone brings up the old cliche about "if you've nothing to hide.."
etc, can I assume you don't have curtains or blinds in your windows at home?

B2003