Just to do with timing. I haven't left enough time to get Class 1.
I start flying very soon.
You don't need a medical to start flying on a PPL course as you will flying under your instructor's licence but you will need it before solo.
I would call your CAA today and try and book an initial Class 1 asap; they may have cancellations or an early slot. If you get a Class 2 initial, you'll only need to get a Class 1 initial later so that's a waste. The audio is definitely a waste unless you seriously think you're going to fail it in which case you won't get a Class 1.
And yes, you must have a Class 1 medical before you sit your CPL skill test.
Cheers
Whirls