I could keep the garage totally separate from the flat, and keep it if we move.
That's true.
Also I was randomly daydreaming about a similar situation to your double garage proposition a while back. Providing you think through the design you'll be able to chuck up a stud wall to separate them again easily enough.
Do it.
You should also get a massive domestic battery.
@hugo7 started
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I could keep the garage totally separate from the flat, and keep it if we move.