Although not much is known about his personal life, he does pose as Ruth's brother "Giles" when she falls for someone the team are watching, and Series 5 Episode 6 revealed that he is a collector of 1970's bugs.

In the officially licensed tie-in book, "Harry's Diary", it is revealed that Malcolm joined Section D in January 1990.

[3] He is also known to quote from works of literature, for example: Our doubts are traitors, and make us lose the good we oft might win by fearing to attempt.

He was known to spend a great deal of time at Thames House - in 2005 a Section X report stated that Malcolm 'continued to take more than 90% of his meals in the office canteen'.

Another moment where Malcolm appears to be susceptible to faltering under pressure is in the episode Diana, in which he is faced with a bomb and has to cut a wire to stop it from going off and killing himself and Adam.

After three days of remaining on the road to lose any potential tail, Malcolm returns to the Grid to inform Harry of the situation.

In Spooks: The Greater Good, Malcolm helps Harry download a part of the MI5 archives to find the Russian officials friendly to the West.

Harry later asked for Malcolm's help to monitor surveillance during a prisoner exchange between himself and terrorist Adem Qasim.