What size in the UK is a US small in a t-shirt?

I’ve just bought a US size small t-shirt and I am getting it shipped over here, but what size is it in a UK equivalent?
I think it’s a UK size medium.

http://www.usatourist.com/english/tips/womens-sizes.html

or

http://www.neimanmarcus.com/category/popup/lacosteSizeGuide.html

should be a 6-8 or by bra size which would be a 34

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