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                         fwiw, my car passed MoT with advisory about all 4 tyres today. 
On inspection, the inner most groove either started to have cracks or had a long crack running along the base of the groove. 
ZV7 are UK made and are just over 3 years old.  Total mileage, about 2.5k as this car is only used as a runabout. 
Previously, I had same problem with a Continental Premium Contact 2 which was bought as a replacement on same car, but to be fair, the tyre was 7 years old.  The other three 8 year old Uniroyals were fine. 
Going to return to UniRoyals as I feel these are softer compound tyres and less likely to crack.  eg. Rainsport 3 
  
  
  
  
  
  
                            
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