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It's only available at the "most advanced paint shop in the world" that is Giga Berlin.
As all RHD are made in Shanghai, it will depend if eventually RHD production for the UK will be relocated there or not... Afaik Tesla hasn't made any announcements yet in that regard.
I saw a Model Y at a SC in Austria recently, looked very good when driving past and immediately spotted "something different" so had to turn around and go back to have a closer look.