Two questions about 4.1 and 4.2

[JHyde]

So THAT explains why I didn't like Season 6......

I think it was also a case of running out of stories where they only sent someone in undercover or met an asset. It's so much more exciting and makes for better promos when you have a countdown that always seems to be stopped with two seconds to spare.

Also, Wollstonecraft's last episode was, I think, 3.5 (I'm playing from memory here. Will check im-whatever later). That would also account for a change in tone.