No breeds originated there. As for what breeds most commonly kept the only way to know that would be if a census was done on cat owners which I'm sure has never been done. You could try Google TICA cats shows Isle of Wight and then see what breeds went to that show on the show report but odds are many people traveled there - they don't live there.
Obviously the most common kept breed there would be the same as everywhere else - domestics - cats of no particular breed just like over 97% of the cats on this planet.
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