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Hole in the wall is easy - the balcony had at one point two doors, the lounge access door was closed up with a window and...plasterboard.
Internal walls are easy, made enough holes in those already...
Separate leccy circuit...not so much.
Howard-
OK. I think your best bet is find somewhere local that installs split units. Choose the room or rooms you want to be hot and cold. Then get a quote.
Or, get a small unit from Argos. Make sure the pipe goes out of a window to dump the heat, keep emptying the condensate water and get used to the noise.
Mr_Sworld
No. You can't buy the units or gas to fill them without the paperwork. And anyone who tells you they can is a cowboy.
And as you need pipework and a separate electric supply that will need punching through walls I'm not sure how you can hide the work.