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Angela Crompton was killed by her husband in 2012, with her name becoming the codeword for people to use to seek help at venues like bars and pubs if they feel unsafe.

The investigation found widespread confusion among staff, with many completely unaware of what the codeword meant despite their venues displaying Ask for Angela posters.

At more than half of the 25 London venues tested, staff were completely unaware of what the emergency codeword meant despite their venues displaying Ask for Angela posters.

The court president said the "Marengo" trial - named after the codeword for the police operation which led to the arrests - was about "ruthless, disruptive violence".

The RAF personnel used "zombie" as their codeword for a Russian plane acting suspiciously.