Here's the direct link to the Airmiles site
I applied for the card when the same deal was offered last year. The deal is a good one, but it isn't quite as straight forward as it sounds. You have to apply by the end of March and spend at least £10 on the card before you are awarded a 1500 mile voucher. This is sufficient for a couple of short-haul flights (we used them on a Glasgow-Heathrow-Glasgow trip for two people) BUT you have to book and pay for at least one night's accommodation through the Airmiles site at the same time as you use the voucher. We simply booked the cheapest available for one of the nights we were away and didn't use it. The credit cards you end up with - one Amex and one Mastercard - give you Airmiles which you can save up to get free flights in the future.
Thanks for the info, sounds ok to me.