It's not about adopting a sole control tyre it's just a limit for financial reasons. For example at the nationals you are allowed to use any Compound of Schumacher or Ballistic Buggy minispikes on the rear axle of your car. These are the most commonly used off road tyres in the UK so almost everybody running the regionals will have some of these in their pit box.
I'm all for a bit of home advantage but if there is such a clear advantage with another tyre, as there was with full spikes yesterday many will simply not be able to compete without them too shelling out £20 quid or so for new tyres that will probably be useless anywhere else.
Don't get me wrong I'm not bitter towards anybody using them yesterday, I admire your foresight it's just an idea to make an expensive day for many due to the distance of travel a little bit more inviting and guaranteeing closer racing.
Chris
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