Yes, it could. We know that lots of things can lead to a payment being late. So, as long as you were up to date last month, and you can get your payment to us within 14 days of the payment due date (which counts as day one), your credit file won't be affected. A late fee will still apply, this'll appear on your next statement.
So, if your payment's due on the 10th of the month and is processed by us on, or before, the 23rd, your credit file won't be affected. But we'll still have to charge you the late payment fee.
Just a reminder that we only process payments on working days, so if you make a payment on a Saturday, for example, it won't get processed by us until the Monday.
If you're having problems paying your bill, you can find more information on our money worries pages.