All members of America, who had a US#1 in 1970 with "A Horse With No Name" had dual US/UK citizenship.

Natalie Imbruglia, Torn, or Our Tash's smash number one US hit and number four U.K Hit, Unwritten?

But Natalie Imbruglia is Australian and Natasha Bedingfield had a UK Number One with 'These Words'.

You might want to clarify that, since Adele *has* had a UK #1 - just not with *that* song...

Yes, that is what I meant - I know that Adele had had 3 US number 1s, but 2 of them weren't UK number 1s!

But Natalie Imbruglia is Australian and Natasha Bedingfield had a UK Number One with 'These Words'.

 

...And come to think of it, 'Torn' wasn't a US Number One anyway. In fact it wasn't even a Top 40 hit, because it only became eligible late in its popularity.