I started watching this in 2016 but only saw episode one. I've just finished it on the iplayer in lockdown 3. Brilliant stuff, I was never quite sure what was going to happen next. I half expected Pine to turn bad in the end. Some reviewers think it was a bit cliched but how many spy / intelligence stories are there, really?
I'm not sure there should be a second series, some things stand better alone.
Having said that I would check it out if there was one.
I found the reviewer who thought Hugh Laurie's accent was all over the place amusing. Hugh Laurie IS BRITISH, there was nothing wrong with his accent. There are lots of different accents in Britain, not just dead posh or Cockney.