There's no way the Beeb could afford Slow Horses - so much of it is shot in London, and not like some other city pretending to be London, but actual London. The expense of it is a flex for Apple, but it would've put off less cash-rich producers.
It's fantastic, but I don't like the characters signature shabby look and vulgar behaviour. i guess it's part of the character design, but it's kinda depressing ngl.