Hi Stu,
You're asking the wrong guy.
Like I said in my post - as far as I know there has been no control tyre in the SE region until now - at least not at the meetings I've attended but I'm not a BRCA official so I can't answer you I'm afraid - I'm just a member like you - but one who had to look up rule 23.12 to find out what you were referring to
I was just posting up a response to help a fellow racer
If you're concerned -its probably best to ask Steve for clarification.
But lets just postulate that 2 control tyres are ruled on - just like at the Nationals - but there's still no ruling that limits the number of pairs being run per day or the compounds of said tyres. (Or at least there isn't at the national BRCA sanctioned events.)
I have to carry Schumacher Yellows, Green and Silvers at every national now along with BB Greens, Whites and even Pinks (in some cases). And even then - I couldn't legislate for 1 run per set of tyres last weekend like the fast guys were doing.