Just got a [half-eaten- i'll have to finish that] can outta cupboard...
There doesn't appear to be a phone number on the bloody voucher... all there is, is the helpline number 0871 434 3160 which has already been posted
seems the actual number is on the vouchers you get posted, not the pringles can. which makes sense but doesn't help you.
btw
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BTW: You not got anyone at home who you could ring?