I'm a 41 in Birkis but I know that's size 8 on QVC, what get's me is normal UK shoes size 8 are too small for me and I have to wear 9's. Oh and not forgetting narrow and normal fit! it's a whole different ballgame re sizing when it comes to Birkis.
i went to town today and popped into the local shoe shop. the birkinstocks all had both the uk and the euro sizes on them and the 42 is an 8 and not a 9 as QVC sizing tells us
Yet Birkenstock themselves say an 8 is 41 so QVC are just saying the same as them.
http://www.birkenstock.co.uk/index.php?m=catalogue&a=sizing