@ mikey74 many years ago (ahem) I did the same before studying earth sciences at Leeds. I would say online is the way to go initially. It’s easier to find a web page, blog, tutorial etc. If you don’t like it, you can move on. A lot of the books are quite generic and not very UK based.
For speed try a starter like arcgis.com (you can sign up for free) and youtube. The concepts are transferable. At Uni, you’ll find a mix of open-source and commercial mostly Esri and Pitney Bowes. I’ve used all of the above and more over the years. Keep on learning, it’s a great line of work. It’s really mixed…generalist roles, programming, analysis. In true singletrackworld style, people have shared their opinions, form your own and buy a log burner after Uni.