Learn Morse Code: https://youtu.be/9ong3hrKNIg Made a Morse Code Keyboard as well!
Learn the Phonetic alphabet: Need to continually practice! https://en.wikipedia.org/wiki/NATO_phonetic_alphabet
Escape Rooms:
1) https://www.puzzlepost.com/product/the-secret-service/
2) Enola Holmes at home escape room
3) fractured fairytales – Helston
Treasure Hunt: Treasure Trails, the view from Carn Brea
https://www.treasuretrails.co.uk/products/things-to-do-west-cornwall-cornwall?variant=39342558871597
Learn about the history of code breaking: attended the online/zoom Bletchley Park talk: Alan Turing – Accidental Codebreaker?