snip
You get an instant £1500 credit limit as well. After 3 months if you
have been a good boy then you can ask to have the limit raised.

It's actually quite convenient because you buy something in March
(say) and you don't have to pay until mid-May. And it works thru the
regular tills too - if you just want a box of screws to take with you
then it's a cheaper/easier way than using extended credit on credit
cards.

You had better make sure that you have been a good boy and had that
credit limit raised a little if you want to buy boxes of screws at B&Q !!