Dunelm Promotion Voucher?

stressedofdevon wrote: »

I just shopped for the first time in a Dunelm store and along with a standard till receipt and credit card slip I was also handed a PROMOTION VOUCHER which has a big distinctly separate barcode and nothing else.

I enquired in store and on their FB page what the voucher was for but no-one seemed to know and the only answer I got was that it was an invite to the customer feedback prize survey, the web link for which is also on the normal till receipt, so that honestly doesn't feel right. Why the need for a barcode? And the word voucher implies some value, at least to me.

There doesn't seem to be a good forum fit to ask the question but I'm hoping someone else has shopped at Dunelm and might be able to tell me what the voucher is for. Feel free to move to a different board if necessary.