Jason Love is a part-time agent for MI-6.
The tag line used by the publishers to describe Love is quite accurate - Love is a country doctor. He makes his practice in the quiet English village of Bishop's Combe, near Taunton in Somerset (for Americans without an atlas, that is considerably west of London and northeast of Plymouth).
While he is a well respected member of the community, he is not what one would think of as a country doctor. He is still fairly young, being in his late 30s or early 40s. He enjoys greatly the company of the ladies and they are easily charmed by his quick wit and quite handsome face. He has a fanatical adoration for the Cord automobile. He never turns down a chance for excitement.
Dr. Love certainly did not seek a role with British Intelligence. He was happy as a general practitioner as it afforded him time to enjoy his great love of Cord cars. Still, when the Deputy Director of Operations of MI6 needed someone, specifically a non-agent, who might help in a mission, he didn't need much time to agree.
Not every adventure chronicled in the nine books was a mission for MI6, although many were. On the early cases, perhaps as a sign of the times, MI6 was determined to load Love down with considerable numbers of exotic gadgets. As time passed, so did the gadgets.
Note: for the record, and because I went to the trouble to look it up, Cord cars were made by the Cord Corporation, founded by E. L. Cord, from 1929 to 1937 and were considered highly prized roadsters. Though the company went bankrupt, due largely to the Depression, the popularity of the cars remained high and enjoyed a resurgence in the 60's and 70's when scaled down replicas were manufactured. They are still being made for aficionados. This is mentioned because Love's obsession with these cars is made use of in more than one important occasion.