If you're talking about Farnell, then they tend to have a habit of doing essential maintenance at about this time in the evening.

However, I think you should still have your shopping cart present when it's back up and running.

But I'm a little perplexed why you don't think you'll get them until after the weekend? They're normally next day, and you need to order by 8pm for any chance for that to happen (although I don't trust it on a Thursday, and I like to get my order in by 5:30 just in case [and 7pm on other days]).