Alec Fincham is an agent with MI-6.
Technically and officially he is a Commander in the highly elite British Navy Special Boat Squadron (SBS), the naval equivilant of the more known SAS but just as deadly (more so, if you ask an SBS member). He has been in this service for a fair number of years and knows his way both on a base or on a ship. Getting involved with the spooks of British Intelligence, however, takes a whole different set of skills to stay alive. Fincham has those tools and uses them to keep himself and his teammates alive.
This is a good thing because when he is seconded to British Intelligence, he seems to be the one who gets the really fun jobs in the most luxurious locales, all said with considerable sarcasm. Fincham, unfortunately for him, has the well earned reputation for getting the job done which means when there is an assignment no one really wants or thinks can be pulled off, it is Fincham whose name comes to mind.
It must be said that Fincham does not actually mind the tough assignments. He gets bored easily and when, early on in the first adventure, he is assigned to train Yanks in America, he chafes because it is boring and safe. Still, he far prefers the missions where he is asked to work with his mates in the SBS and not so much when he is going it alone. And he has to go it alone quite a lot. This may explain why he is on a friendly first-name basis with Sir Charles, head of MI-6.
Fincham is described as having an "athletic six foot one inch frame" along with "laser blue eyes". He is ruggedly good looking and is considered interesting to the ladies but he is quite happy with his American girl friend, Penny Jenkins.