Good luck trying to return something to ASOS.
I paid for the ASOS premier service, which entitles me to a free returns collection for each order that I place. However whenever I order one they never show up, so I have to re-order and they charge me £2.95 each time.
Recently I re-ordered a collection service (at £2.95 despite the fact that it should have been free but it never arrived) only to be told at 2am that it has been cancelled because of maladministration. So I re-ordered it, however a courier arrived to pick up the cancelled order.
So far ASOS has scammed me out of £5.90 for services that should have been free to me, and I'm still waiting for a refund on items that should have been returned a week ago.
I highly recommend avoiding ASOS unless you're positive that the items will fit and you like them.