It caught my eye as it looks to contain a BEA Whirlwind which was being used by the Nottingham City Police for a training exercise. They were teaching the dogs to do such tasks as "Tracking enemy parachutists" as well as tracking a radio van in a mock atomic explosion situation.
Have a click on the full page thumbs and read through, I found it quite intresting and hope you will too.

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These few show the people, and dogs.

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Rob.