I had no clue about the British spy either and in some way it was nice how it even included the events of late S2 when Philip was involved with that chiropractor.
man John Lithgow was amazing!! It was amazing to see him again in this role even if it were for 1 scene!!
But I loved seeing him share the screen with Olivia
In all honesty this was the ep (having seen 4 so far) where I had to adjust to the new characters a little but all in all it was a great ep to start off with
IMO it set up the relationships as they currently are
it's hard to go into details when you go through 4 eps in a day