Money off Nestle cereal vouchers

I've searched on the forum's but can't find anything about this anywhere! If you buy a promotional pack of Honey Nut Shredded Wheat, Fruitful Shredded Wheat, Frosted Shreddies, Coco Shreddies, Honey Shreddies or Nesquik Clusters it will have a promotional code on the inside, which you can register here and then you will receive 3 vouchers for a pound off and 4 vouchers for 50p off the same cereals.
It seems a bit fiddly, as you don't get all the vouchers in one go, and you obviously have to buy a pack before you can register, but if you normally buy any of these cereals anyway it's a pretty good deal I guess!