First off I have only ever wired a plug before so any advice you give
me will have to be REALLY simplified, sorry. Anyway...

I am trying to run an electric supply to my stone outbuilding. I have
bought a kit with all the armoured cable, RCD plug, waterproof socket,
junction boxes etc etc. The instructions are ok & I am following them
but I have a question...

Each end of the armoured cable has a junction box to connect it to
flexible cable. Does this have to be so? Can the armoured cable be
terminated directly at waterproof socket? Can the armoured cable go
straight into the RCD plug?

The placing of the socket inside the house means that (if possible)
this would be the easiest way- bypassing the whole junction box wiring
bit.

Thank you & apologies for my knowledge-free language LOL!!