That's a nice paperwork item combining SW with AF. I haven't seen one of those before, but looks like it was given away in stores in the run-up to Christmas.
It's another piece with the Erdington, Birmingham, UK address on it, where it seems they handled all their offers and competitions - judging by previous paperwork items found usng this address.
I like how as part of the offer you had to send in your till receipt or mail order invoice, along with the instructions from your purchase - which they stated they would return to you
Alex, I'll be glad to add this to the other vintage collectables section, cheers.