GCHQ Christmas puzzle (1 Viewer)

[Clivefog]

Stumped by language and engineering. Having read a post above language now sorted. Engineering will be worked on paper as I can't do it in my head.

 

[monzer]

Stumped by language and engineering. Having read a post above language now sorted. Engineering will be worked on paper as I can't do it in my head.

Yeah pen and paper definitely needed for a few of these.