Puzzle Post UK Ltd

My name is Bernard, and I am the Head Elf at Santa’s Workshop this year. I have a VERY special message for you this year - that Santa has asked me to deliver just to you. We don’t want just anyone to read it, so I have hidden it behind a set of puzzles.

The Puzzle Post Space Station is in low orbit around the earth, and has intercepted radio waves carrying a secret message. Astronaut Alice has hidden the message behind a series of puzzles to keep it safe, can you solve them to reveal her message?