Being a bit cold blooded, I tend to stick to the MTP shirt, but have the lighter weight CS95 version for the warmer months - soooo much easier to roll up sleeves!
To my mind, until they issue staff and cadets with MTP kit, as long as it’s serviceable, either version should be OK.
Once had a bit of chat with someone who mentioned about MTP trousers with an ironed in crease.
I had bought them, they had previously had a crease, so used to iron it back in rather than have the white line. My second pair didn’t have a crease when I got them, so they stay flat.
Seemed logical to me, but this member of the uniform police didn’t agree.
Too many other more important issues out there to worry too much!