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This is an interesting topic.
The FIA has released a new set of regulations which is available on the FIA Website and FIA Historic Database if you download the latest version of Appendix K published on 18.12.2021.
Additionally, this does not apply as of today but only from 01.01.2022 but will not allow the swap of historic tyres for CR6ZZ as an example as the later is not an historic tyre in definition but a more modern alternative. And if you take the time to read the regulations and available update, there will basically be an allowance for tyre manufacturers to enter the market of vintage and historic tyres providing they comply with the definition, geometrical and construction parameters of what an historic tyre should be.
Moving on, I would back the words of Rudolf. As bad as it can happen with Dunlops, it is not all related to moving to Portugal but the effect of various aspects of today's historic sport that we see in the behaviour and manufacturing of historic tyres. We should first be thankful that there are tyres convenient for the cars and then consider at how the sport has grown, the number of races, the circuits, the cars and their performance.
Altogether, the manufacturing and tooling has not change, the compound has evolved and is a constant battle as you cannot use products that were the essence of it back in the late fifties or sixties due to regulations and their evolutions.
I do understand it's not always perfect, round and that some tyres have failed but on the other hand the cars are just getting faster and faster every year. Minis have had to have their tyres specifically reinforced for that reason, not a period thing but something which happened because of historic racing. Then, we have Juniors lapping at incredible speed at Goodwood if you look at the period reference and compare, same for the later GT cars and so on so no wonder the tyres are having a hard time keeping up with that.
Maybe one should consider slowing down a little for a little less troubles?
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