You will most likely get a couple of samples of fairy fabric softener and even a muslin square if you are lucky. In return for this generous offering, they have your name and address that they sell on to just about EVERY childrelated advertiser in the UK, and you will be FLOODED with junk mail.
Once or twice a year you get to pick up your bounty pack in either boots, or mothercare, or some other local place. If, and it is a very dubious if, there are ANY left, there will be maybe another fabric conditioner sample, or maybe one weaning spoon, or even a little pot of Heinz banana pure if you are lucky, along with brochures and advertisement. I never got any further bounty packs than that very first. EITHER there were none left, OR you had to bring with you a special letter that said it was your turn to pick one up, and even if you did bring your letter and you could see the bags there, you can be sure there was something else you needed to bring, and you would any way walk away empty handed.
But that is just my experience.
I am sure others will be a long shorty and tell you it is glorious!