I'm with Snigs. I love teaching, even part time and mostly trial lessons! I have been told by someone who has known me for years, even through my time in the Navy, that she has never seen me so happy and contented.
The JAA decided that instructors would not be dedicated when they would not allow PPL holders to earn money instructing. A CPL became more expensive and difficult at the same time. It is now so expensive to join a career that offers a bare living, if that, that you see very few people starting out to be career instructors. We have ended up with a mix of malcontents stuck (perhaps without the attitude of mind to be commercial pilots) as instructors, people passing through waiting for a "real" job (I call it that, but only because I cannot persuade my girlfriend that instructing is work!), a few people like me who always wanted to be instructors as a hobby alongside a well-paid job and a few people who have been flying for years and who want this as a pleasant career.
There is a lack of quality instructors - we have been called at work by a school wanting two full-timers, unable to fill the vacancies with acceptable candidates. One of our former students, who knows our FI(R) course, called to see if we could put anyone in touch.