I've no idea why they've never copied what Ideal World do, you can purchase multiple sizes/colours (all at cheaper postage) and send what you don't want back for £1.49 because you get the option to buy a Collect+ label at the checkout, QVC this global American multi, multi million pound group can offer its customers that surely, the fact they don't proves to me that they've made their profit through postage out to you, they're not bothered in the slightest what it costs you to return, so much for caring about its customers eh? Yet another reason, as if I needed one, that I'd never shop with them again.
Don't return them separately because they'll say only one was scanned at the warehouse and you'd have a hard time proving otherwise (I was a customer for the first twenty years and this was my experience)