If you have a Currys/PC World account, could you try signing in please and let me know if it works?
I've been trying to sign in for days now and have changed my password several times, but it's not being accepted.
I phoned and they said they would send a 'ticket' to the tech team and to try again later.
They're going to lose a lot of custom from people who want to order online.
Unless things have changed very recently, you don't need an account with Currys PC World to buy from their website anyway. You simply ignore the sign-in procedure and purchase as a guest. (That's how I've always done it).