Thanks to ALL for your help with this. :
I've been out this morning and bought the Coopers Stout (ã14) and the beer kit enhancer (munton's) (ã6 for 1KG) from Wilkos (cost ã20 in total, I could have found it cheaper online but I want to crack on today if possible and it's still worth the money).
I'm going to go very basic to start (just as I did with my wines) and build from there as I get to grips with the basics.
I'm not expecting anything special here and even if it doesn't work out it's worth it for the experience.