Just that really!
Seems to be a lot of free advertising for TKMaxx (t-shirts), Sainsbury's (red noses), Malteasers etc.
I would be less cynical if it weren't for the fact that they seem to have exclusive deals, e.g. you can only get the t-shirt from TKMaxx. That must be for TKMaxx benefit, as it's not like there is a TKMaxx in every town, so it's reducing the reach of the item.
Am I just a cynic, and these companies really are doing it for the greater good?