No problem at all, it happens, especially with sizes.

Start your return on our Delivery & Returns page. You'll need your order number and the email address or postcode you ordered with, and you get a return number straight away.

You've got 14 days from when your order arrives to let us know you'd like to return something, and another 14 days to get it in the post.

All we ask is that it comes back to us unworn and unwashed, with the tags still on and the packaging in one piece. We know it's tempting to rip the bag open, but we do have to be able to sell it on, so please open it gently. Trying something on to check the fit is absolutely fine.

We'll email you a note to print and pop in the parcel. No printer? Don't worry, just write your return number on a piece of paper and put that in instead.

Send it to:
School Wear United, FAO Returns Department, 3 Crown Dale, London, SE19 3PB

One tip: use a tracked service and hang on to your receipt. The parcel is your responsibility until it reaches us, so it's worth having proof it's on its way.

A quick heads up: for hygiene reasons we can't take back underwear, socks, tights, base layers or swimwear once they've been opened, unless there's something wrong with them, of course.

Have a look at the product page for whatever you're buying. Every item lists the sizes it comes in along with the actual measurements. Depending on what it is, that'll be an age (5 to 6 years, say), a collar size for shirts, or a waist and inside leg for trousers.

Our honest advice: grab a tape measure rather than going purely on age. Two children the same age can be completely different shapes, and it saves the hassle of sending something back.

It's also worth checking each product page rather than assuming. Sizes do vary a bit between styles and brands, so a 9 to 10 in one thing won't always match a 9 to 10 in another.

And if you're still not sure, just ask us. Tell us the item and your child's age or measurements and we'll point you to the right one.

We usually get orders packed and out the door within 1 to 2 working days. The delivery clock starts from then, not from when you place the order.

Spend over £75 and Economy delivery is on us, after any discount, for UK addresses.

Just so there's no confusion: we don't offer a next day or named day service. Premium Express is the quickest we go.

You'll get a tracking number as soon as your order is on its way. If you'd rather we just checked for you, message us with your order number and the postcode or email you used, and we'll take a look.

We don't do swaps by post, but here's the good news: you don't have to wait for us to receive your return before you order the right size.

Just send the wrong size back for a refund, or store credit if you ordered with an account, and place a new order for the size you need straight away. That way the correct one is on its way to you now, rather than sitting in a queue while two parcels pass each other in the post.

Not sure which size to go for? Message us before you order. Tell us the item and your child's age or measurements and we'll tell you exactly what's available and what we'd go for.

If you've changed your mind or need a different size, the postage to send it back is down to you. Your refund will usually include the standard delivery cost, but not any extra you paid for faster delivery.

Pop to the Post Office or a parcel shop and choose whichever service suits you.

If something's faulty, or we've sent you the wrong thing, that's a different story. That one's on us. Start a return, choose the reason that fits and add a photo, then hold on to it until we reply, usually within two working days. If it's our mistake, we'll email you a prepaid return label so sending it back costs you nothing.

Once your parcel reaches us, we'll have your refund sorted within 14 days. In the thick of the back to school rush it can take us a little longer, so please bear with us if it's August.

Worth knowing: you probably won't get a separate message saying your parcel has landed with us. The one to look out for is the refund confirmation, that's your sign it's all gone through. After that, it can take 5 to 7 working days to show up in your account, depending on your bank.

Want it quicker? If you ordered with a School Wear United account, you can choose store credit instead when you start your return. It's usually on your account within 1 working day of your parcel being checked in, so you can spend it straight away. Store credit isn't available on orders paid with Klarna.

Keep your proof of postage safe until the money's back with you. And if it's been more than 14 days since your return was delivered to us and you've heard nothing, give us a shout and we'll chase it up for you.