I know they are part of the Littlewoods company, so it is obviously upto yourselves wether you wish to take up the offer. I ordered a pair of these and another pair of trainers with the £20 off plus free delivery code. All went through fine cost £69 for my order . Even without code they are still a decent price.
Sizes 8 &9 are out of stock however all other sizes available, these do sell quick.