yeah, but how many bikes in UK all year long compared to southern countries ?

Having a track like the isle of man does not mean it's a bike country mate

no offense tho, bikes are just VERY few compared to the rest of sunny countries in europe, and that's quite to be expected, no ?

Who leads the worldwide bike market, except Japan ? Italy -> for riders, and for brands. That's pretty logical, they have a bike culture as they CAN use them all year long.