After studying Maths in Manchester and Theology in Cambridge, I spent nearly twenty years in full-time Christian ministry, regularly preaching and teaching through the Bible. After that, I joined a Pentecostal church and spent another twenty years teaching Maths, Statistics and Computing in schools and Further Education colleges. Now that I've retired, I'm still doing some Maths teaching, and am using a lot of time writing books. My grandfather, John Taylor, left his work as an apprentice blacksmith, and became a colporteur, distributing tracts around villages in the west country. As his work