In my view, the problem for many car parts being MOTed is that they look fine until they break, tyres included. I agree that unless some kind of test is devised to check the hardness/brittleness of older tyres, then, to be honest, 10 years is a reasonable guide to when a tyre needs replacing.
I'd previously run tyre on my current car (a 2005 built Mazda3) and my previous car (a mid 90s Nissan Micra) for a maximum of 6 years, as on both occasions I found the tyres got too hard (I am not hard on tyre in my driving style and they last 40k+ miles) and were very poor in the wet, and had started to get noisy, even though on the Mazda they still had plenty of tread left.
That's fine when you run a newer car more regularly, but tootling around leisurely in a classic car once a month it may be less noticeable unless you drive in poor conditions or at higher (though still legal) speeds. I would also suspsect that, even with the latest tyres, damage is still done by a car either sitting outside in variable weather conditions, including in direct sunlight (which damages lots of things) or large variances in temperature, which is why rare/expensive classic cars are stored in sealed, climate-controlled warehouses by the uber-rich.
Those 'made in England' Dunlop tyres were probably made at the same time as the OEM ones fitted to my old Micra, which I changed in around 2002-3. Its one of the problems with owning a classic car like yours - parts will still need changing (despite what another certain Backroomer who owns a 'classic' car [his opinion] himself says to the contrary) as if it were being used, in line with the manufacturer's service guidelines. Unfortunately those don't extend to tyres.
In my view, 10 years between changes if a car were garaged may be acceptable if you can determine by feel when driving (as well as inspection) that they aren't going hard (and brittle/the rubber [or equivalent] seriously deteriorating, which yours probably did), but if its kept outside or you want to err on the side of caution, then I would change them at 6-7 years old.
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