Philip Driver is an agent with British Secret Service.
Exactly what agency he works for is not specified. What is shown is that the department is a small, highly secretive one with missions taking place all over the world with a decent number of operatives and assistants. It is run by an unnamed older man called the Chief by his people and having a particularly nasty attitude towards those who decide to leave his employ before he is quite done with them.
The title to each of the several recorded adventures of this operative have the description of "Golf Spy" which makes him rather unique in the cloak and dagger world - someone who wears spats instead of a cloak and wields a golf club instead of a dagger.
When we first meet him, he would not answer to that at all. Golf was something he had played a few times here and there over the years and had a basic understand of and some skill in the sport but it was for occasional fun and not at all related to his work as a field operative. That is when the cover role for his latest mission would change his life.
After a short but intensive training period to brush up on his game, the athletic Driver, likely in his late 20s or early 30s and possessing a definitely flair for action and excitement, is put on the pro circuit for one particular mission. It is after that mission was completed that the Chief tells Driver, Agent 721, that Driver would continue to use the cover for missions in the future. It did make sense in that golf was played around the world and tournaments drew lots of professional players so no one would question Driver's appearances. This was especially true when it turned out that Driver had a real knack and love of the game.
Accompanying Driver on his missions, acting as his caddy and traveling companion, is the short, burly older man named Jones, his first name unknown but having the nickname of "Peanut". This man with his penchant for V-neck sweaters with a tie instead of a sports coat is Driver's friend and partner before the adoption of golf as the cover and it is clear that the two are best of friends.
A couple of missions after the start of golf cover, Driver and Peanut decide that they could earn a pretty good living on the circuit and leave the mayhem and danger behind so they resigned and went on their way. Unfortunately for them, the Chief, as mentioned above, is not prone to letting his agents just leave. As a result, deception is often used to force them back for "just one more mission".