I just watched this after a recommendation from here.
I watched all 13 episodes. I hated it, lol. Every single person so fucking unlikable. The main people so 'wet' and spineless.
It has similar energy to Upstairs Downstairs (original). But whereas in UD the characters are nuanced and sympathetic, in Flambards they are just annoying, and whenever one died I was glad.
I think the only one I liked was the German.