Good point, thank you
I was told recently that my friend's bamboo nappies are better for the environment than my microfibre ones, but there's not a lot of bamboo grown in the UK...!
More research needed
There's more to it than distances. Bamboo grows extremely fast and without chemicals. Again, there's more to it than that, but it's generally thought better for the environment than a lot of other materials. Non-organic cotton is terrible, one of the worst plants for chemicals. There's also the processes used to turn a crop into a fabric to think about.
Onelife, whilst not made here (I think possibly made in Turkey, they were talking about moving production from China to Turkey a few years ago), are shipped rather than flown here. Or they used to be.