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As already stated, the SE speed grouping has not gone list 1b (again - it was there in 1993 or 4), only kit cars can now use 1b. Real cars still have list 1a there, as they do in midlands etc.
The tradition of production cars in speed events, going back many years, was to bring racing tyres (before slicks arrived) in the car, even if driving there on the road, and change to them. Slicks last longer than sticky road tyres and would be cheaper overall. On hill climbs they are closer to performance of sticky road tyres than sticky road tyres are to list1a (personally involved in back to back tests that confirmed manufacturers' advice).
Another bit of more recent history worth remembering is that these ludicrous "soft" road tyres were unheard of until the routine use of Michelin TB15s (a medium compound Intermediate rally "race" tyre) in road rallies was jumped on. Suddenly, instead of running a whole Motoring News Championship road rally on a set of TB15s, top runners were carrying 4 spare Avon CR28 Sports etc and changing the rears twice. What a nonsense. What has comparatively recently appeared on list1b? - Michelin TB15s!
If kit (sorry "limited production") cars are now sold with sticky road tyres, that is no reason to allow them to be used. Perhaps the manufacturers of such cars should be told to show more social responsibility and not fit them to cars sold for the public road. Sticky road tyres are the cause of unlimited misery and regulation confusion in club motorsport over far too long a period and should have been put down at birth.
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