Ok I'm not even from the UK, but I did 3 nationals in the past years. I never had to use many tyres though... Last race was eden park where you have lots of different surfaces, never felt the need to put new tyres on every run (and made c final in both classes).
It's true that taking new tyres is an easy solution to shave a few seconds of your times, but imo there are lots of other things to do that will have a much bigger impact.
The scrutineering argument is so true. Also the problem with blown tyres, or damaged rims. In the end you will come up with something like allow 3 sets of tyres to be used, which probably is more or equal to the amount you're using already. What to do when it starts raining, etc...
It's not because some people use a new set every run, that you have to do it too. Some top guys just do that to make sure the car is 100% the same each run, not because it's supposed to be faster.
Tyres definatly are a big chunk in the racing budget, but I don't think you will save loads of money by introducing a tyre rule. If you see what stuff people spend their money on that is totally useless (but for example just looks cooler), I think there are better ways to save money. I also don't think there will be people ending up much higher if there would be a tyre rule. At least I don't believe I would have had better results just by taking a new set each run.
Maybe you can also make a rule for how many cars everyone can use in one year :-) Probably many top drivers take new stuff all the time, which is something the majority of us also can't. And that affects your race times too.
I don't think any rule can take away the 'feeling' that some people are faster just because they have a bigger racing budget...
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