...or, you could
actually go to the proper, official source of these data, the UK AIP. Look in Gen 3.5, where ALL the codes may be found:
https://www.aurora.nats.co.uk/htmlAI...dex-en-GB.html
We encourage all our students to look stuff up on the proper, official sites as provided, and of course, it's FREE! This also applies to NOTAM, upper wind forecasts and more. When they're qualified, then they can start using the APP of their choice.
When I were a lad, we had the paper 'Air Pilot' (several large volumes that took up a whole bookshelf) that us students were required to update using the periodic replacement sheet that arrived by post. This usually took me a long time because I became sidetracked in reading the stuff and noting how the various sections were laid out. I try to pass this on but it's so hard now. I find that after 10 mins or so, their attention has waned ( or maybe it's mine that has!)
TOO