Hi Ian101,
When you left the motor trade the 'credit crunch' was well established and the motor industry was not in a good state. It was a very stressful time for those left who weren't 'let go'.
Things have settled down and the motor industry seems quite boyant at the moment and has been for a few years, so I can see the draw back into it.
Self employment has its advantages, but also its disadvantages.
I also wish you all the best mate.