Thanks for your reply, Baboon.
I recorded myself playing using my phone, but the quality is pretty horrendous. What are people usually using to record themselves?
I bought Johnny’s book on ‘How to Play Saxophone’, which I’m finding helpful. I’m doing the exercises in there with all 7 ‘normal’ major keys at the moment. Once I’ve memorised the scales completely I’ll then learn the 5 sharp/flat major scales.