It's a long story but the short version is that at some point whilst on night shift with Youngest, I started looking at online courses. There's plenty of online edumacation kicking about - MIT OpenCourseWare in particular is great, but in the new world of MOOCs it's no longer just a zillion hours of filmed lectures and pdfs on the side.
The three big guns are Udacity, Coursera and EdX. Thye're all pretty good in their own ways, though Coursera currently wins for having an Android app that lets you download lecture videos - ideal for the train commute.
More to come.