We also came across this by accident a couple of years ago. Unbelievably well-made and riveting, though quite harrowing throughout. I wish I could forget it so I could watch it all over again.Accidentally ended up watching the whole of the pilot for The Americans (Disney+), a spy drama set in the USA where the protagonists are deep-cover Soviet agents. Looks good and I could well dig into this further.
I have binge watched all of Orphan Black.