Somebody was writing to Flight Attendants at Gatwick Airport.

Horrible, threatening notes asking for pornographic pictures and threatening violence if the demands weren't met, based on the throw of a dice.

"There are six forfeits ranging from minor to very painful... Number six is an attack with an acid bomb, although there are lots of nasty things from number three onwards."

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Sources
https://www.theguardian.com/uk/1999/apr/15/duncancampbell
https://en.wikipedia.org/wiki/Tesco_bomb_campaign
https://www.anthonygardner.co.uk/interviews/forensic_psychologists.html
https://www.theguardian.com/uk/1999/apr/08/duncancampbell
https://www.dorsetecho.co.uk/news/5398943.terror-plan-hatched-in-gp-waiting-room/
https://www.theargus.co.uk/news/6789592.blackmailers-sentence-cut/
The Real Cracker : Documentary | What Happens Next On The Real Cracker with digiguide.tv
https://thetruecrimeenthusiast.co.uk/the-gatwick-blackmailer
https://www.theargus.co.uk/news/6797822.eight-years-for-airport-blackmailer/