There are instructions on the forums here for how you can disable the speedlimit warnings.
There are two places, one is in your settings and the other is in the navigation application (the native one). Both have to be disabled as far as i recall.
As for the key, i dont know why but you in the UK have a different key than what i have here in Norway.
I have the "normal" key with the physical key located inside the fob.
From the instruction manual:
View attachment 40428
I have type A which has the physical key (4) hidden inside it, like option C. Option B seems to have it separately, and with a loop.
Im sure there is a reason why the UK uses option B, but no idea why.