Ok, so I've learned two things.
One:
When something concerns me that is a safety issue I should put the effort in with the school staff to understand the problem fully. Due to the depth of knowledge and professionalism that CSS staff have always displayed when I've been there I found it hard to really push the issue, thinking it was me that was more likely to have the wrong reasoning.
Two:
This place rocks. It's like having the school in my computer. Why did I lurk for so long
Also, I kicked myself for not bringing it up during the theory sessions and particularly at the afternoons wrapup when Steve Brouggy stood at the front of the room and said in a very clear voice "Ok any questions about today or anything about motorcycling in general?" We all sat there like stunned mullets, of course, with me straining to think what it was that I should have been asking. I had the forehead slap moment half way home ------ "DOH, THE TYRES!!!"
But the forum here has certainly worked for me, to help out after you've left the track.
Thanks for all replies.