That's Lucas North, a character in Spooks!!
Saw it coming really, I even figured out how and when, before it happened (which is unusual for me, normally I can't spot the most obvious plots!!). I will miss the character of Lucas though, I liked him. Mind you I've liked all of them so far and being Spooks you get used to characters that come and go.
So, even without Lucas I shall still love Spooks, and am very happy to see that the next series has been confirmed!!