Hi Rozybozo.
I wouldn't say that locality doesn't matter in the UK. It's more a case of locality being almost universally unavailable for the rosies available here. The existing stock was mostly imported long ago and the locality data is long lost, if it ever existed in the first place. To say you have access to a wider range of rosies in the US is an understatement. I would love to see more imported but as most people here tend to specialise in genetically abnormal ball pythons i don't know if demand would be great enough. It certainly would from me though.