Hi Yann (or should I say "bienvenue"?)

With luck, someone with the details will wander by here, but in the meantime, I think those "special rules for expats" in the UK refer to wealthy Russians who are living in the UK, but who do not work in or get their income from the UK, but from "back home."

If you're going to be working in Scotland, I think you're subject to the same old tax laws as everyone else. Though, because the tax year in the UK runs from April 6th to April 5th (I think it is), there may be some complications in filing your first year away from France, since you may wind up being "resident" in both France and the UK based on the timing of your move.

As far as I know, you don't have to file French taxes if you are considered "resident" in the UK - which usually means if you are there more than half the tax year - unless you have income coming from France, like investments or if you are renting out your house while you're gone.

Anyhow, with luck someone well versed in the UK tax situation will come along with some more details for you.
Cheers,
Bev