Laurence Payne wrote:

You can be tracked all over the place by several means. Mobile
'phone,

It always amuses me when on a programme like Spooks people chuck their
phones away to avoid being tracked. Why don't they just turn them off?

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http://gallery120232.fotopic.net/p9767103.html
(302 990, in parcels livery, stands at London Liverpool Street in 1989)