the road to learning useful math
hyperbovine: Go back to school. I'm not sure how this works in UK, but here in the US your local state school usually offers part time masters degrees for people who are working. I started my masters in math a year ago and the change has been profound. It's like night and day, what I knew about math a year ago vs what I know now. If you are serious about learning math the right way there is no better option.