Richard Graham is an agent for British Intelligence.
Part-time agent, he would likely insist his position be considered. He works for Sir William Bellamy, director of a small offshoot of Her Majesty's spy network but only now and then and since the amount he gets paid for his odd jobs would not, as he tells it, "pay the rent on his flat", he is happy to go on thinking of his work as just a once in a while affair. Since he did get paid for it, however little he might consider the salary, he was not an amateur but he is honest enough with his abilities to never think of himself as a real professional.
What he does consider himself is a steeplechase racer. The love of riding and competing has been in his blood ever since he was a young boy and first sat astride a racer. Riding was a joy and the thrill of doing so while the animal is galloping down a track, leaping over various obstacles, all while trying to avoid ten other thundering steeds and come out on top - now that was excitement. It was an occupation not quite as dangerous as having enemy agents shooting bullets at you but it was by no means without its chances of injury or death.
From the time he became an adult, Graham has enjoyed a modest (to him, very modest) allowance from a trust fund which paid for a pleasant, though not extravagent, lifestyle. The trust was under the control of an uncle who was friendly but sternly frugal and on more than one occasion, a bad investment or a horse he just had to buy but which did not perform as hoped, all joined to make him always open to outside funding. That is where Sir William came in.
Though he did not have to work for a living, Graham was by no means a slacker or a wastel. He had served honorably and well during World War II as one of the first Commandoes England produced. His efforts on the Continent fighting the Germans, often behind enemy lines, was noted in dispatches more than once. So to was the fact that after a mission had been betrayed by a turncoat and Graham captured and sent to a POW camp, he managed to escape and make his way through Spain to freedom. After that, his knowledge of that area proved invaluable to Military Intelligence.
After the War, Graham was through with the cloak and dagger world, or so he thought. He returned to his racing life where he continued to work as an amateur racer on his own and other peoples' horses. He won a fair number of times, enough to have him thought well of but as time progressed, he knew he would never reach the top tier in the sport. That did not bother him too much as long as he could continue to hold him on. As the series progresses, though, injury will force a change to that.
So will his association with Sir William. That came about because of some one he knew being someone Sir William wanted to know more of and when the Director learned of Graham's past experience in the field, albeit in wartime, he forced a meeting and pressured Graham into helping. For a while theirs was not a friendly relationship but one forced by circumstances. Over time that changed and they became a good deal friendlier but that would never stop Sir William from sending Graham into harm's way.
Throughout the series, Graham is happily a bachelor with no steady love interest. He has an eye for the ladies and when an opportunity arises, he does not hesitate to partake of their charms, but he pines for no one and no one really pines for him. On occasion he is known to drink a tad too much too often but he will usually realize his errors and slow down, for a while. His fortunes will rise a bit and fall a bunch and his love affair with horses will stay true. His love of the excitement of the spy game, though, will never become that strong. He is a horse racer by profession. He is only a spy part time.