Best polo shirts

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Can anybody recommend plain white polo shirts that can be tumbled without shrinking? I bought DS1 some from John Lewis for when he started reception this year, and they're already 3 or 4 inches shorter than when I bought them! Friend has had similar experience with M&S, so where should I try?

Thanks!

I never tumble dry anything I don't want shrinking. I find it completely kills decent clothes. So I have a clothes horse in the spare room next to the radiator for stuff to dry. - sorry I know thats not answering your question but have found it to be the only way

Asda - have always found them very good in the "not shrinking" department - also they are cheap!

Thanks - sadly Furball I am all too often finding all the ones I've bought dirty the night before school, so need to be able to tumble in an emergency! Any other suggestions please? Don't have an Asda nearby...