Brian Cox
Very famous. Doubly received his laurels with Succession
Kate Mara
Lol.
Charles Dance
Same as Cox but to a lesser degree. Still very famous and appreciated. Was one of the last bastions of quality on GoT.
Jason Flemyng
Eh, he's a good actor. He found his niche with Ritchie and kind of stayed in that world. Wouldn't say he's underachieved too much though. I also remember him leaking the Star Wars TFA script picture and being immediately passed on the project kek
Derek Jacobi
One of the quintessential "that guys". He's like nearly a 100 years old and still working last I checked. Will always be remembered for Gladiator.
Mackenzie Crook
This is the one. Only head scratcher you've really posted where his career does not align with his talent whatsoever. Excellent actor. Excellent writer. Excellent director, remembered as a creep in The Office and one half of the Pirates of the Carribean dumb and dumber. I highly doubt a more fitting answer to OP will be posted in this thread. Mackenzie Crook is mega based.