We're going way beyond the OP. We're now on to the legality of tyres on the public highway. I've spent a LONG time talking to the MSA about this as competitors don't know what tyres to run where and when. There is no "blind eye" in the eyes of the Law, but there is a great deal of scope for interpretation of Construction and Use Regulations. Many road rally cars WILL be used on a daily basis. The main issue is "suitable for purpose", for the purpose the vehicle is being used at the time when stopped.
Again, can a tyre which is described as being for dry asphalt use by the manufacturer be acceptable in the rain? This goes beyond the Police, it's what a Barrister/Solicitor could claim in Court. Just because a tyre is E marked tyre (when new) doesn't necessarily make it 100% road legal , the vagaries of "suitable for purpose" apply. Is an E marked gravel tyre suitable for use on the road? An E marked tyre designed for use on gravel being used on asphalt, is that suitable use?
E marking is aimed at helping consumers make decisions about tyre choice. It doesn't define a road legal tyre, but can be interpreted this way.
The Welsh Police have taken the stance that an E marked tyre is road legal., subject to subsequent wear from new. That's great, everybody knows where they stand. But this stance isn't universal across the UK. However if I was stopped using an E marked gravel or 1C tyre on the road outside Wales, I'd supply contact details for the Officer in Wales who has progressed this position. One application of the law in one part of the country, potentially another in another part!
Non E marked tyres are legal on the road, the Police use them. "Suitable for use" applies.
A048 tyres, E marked are not, are rioad legal subject to specific use. I've been informed that there's no physical diference between either A048 tyre.
Specifically, the E marking of the A048 is irrelevant to the MSA - they're on List 1C, E marked or not. Current guidance from the MSA is that tyres on 1C should not be used on the road. This is where this issue started with the MSA - E marked DMACK DMT-RC and A048 tyres were presented fitted to cars on some road rallies and they were refused a start by Scrutineers. Why should a "road legal" E marked tyre be rejected from a road rally? Because they were deemed unsuitable for use by the MSA.
Yes, this is very specific to competition, not general road use, but if I was wanting to prove blame on the driver of a car in a road accident and they were running tyres on list 1C, I'd use the guidance from the MSA against the driver.
Don't you love this! Everything seems relatively simple, then you drill in and it's far from simple. Again, not my thoughts, just communicating the thoughts from the MSA in this very sensitive area. Personally, I take the view that if I can avoid reasonable risk then I'll do so. I'll be using E marked gravel tyres which are also marked "For Rally Use" on a road rally in two weeks time, but I won't be driving to the start on those tyres as I'm not actually on a rally. More road oriented tyres feel way better anyway on the way to the start. Exactly the same would apply to my tyres marked "For Competition Use Only". Interestingly, in this latter area the MSA believe tyres marked with "For Competition Use Only" are fine on the road when actually competing, but the Welsh Police don't!
Bottom line, understand the risks and make your own judgement, there is no definitive position regarding the legality of tyres on the Public Highway. A great deal of interpretation, right or wrong, of old laws can be applied. If you have an E marked tyre then you're more likely to be ok, but not necessarily.