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Re:The personal SOS messages the BBC used to send by phkamp on Tuesday August 21, 2018 @07:23AM (#17808650)
Back then the first three letters of the license plate identified the city council where the car was registered.

There wouldn't have been a lot of cars in London with that particular three-leter code which increases the chance of recognition a lot.

Re:The personal SOS messages the BBC used to send by rwmj on Tuesday August 21, 2018 @07:35AM (#17808698)
Still does (the first two letters anyway). https://en.wikipedia.org/wiki/Vehicle_registration_plates_of...
Re:The personal SOS messages the BBC used to send by NeedMoreTea on Tuesday August 21, 2018 @07:49AM (#17808758)
It used to encode the town or part of a city, now it gives a region that could be anywhere in several counties based on the nearest DVLA local office (now all closed).