Instructions:just spotted this in the currys site - at the time i looked at the site, it was being updated and was temporarily closed, but it had the following text on it...
Our website is currently undergoing maintenance to improve your experience of shopping online with Currys.
Please come back later and benefit from free delivery on all orders over £49. Simply enter Free49 on the shopping basket page when completing your order and click the update button to claim your free delivery.
Nice of them eh?!