The voucher is not unique so just print it off and take it along. You can claim any bear that's £12 for free!
Might be worth setting up a Bonus account here just in case they ask > https://www.buildabear.co.uk/on/demandware.store/Sites-buildabear-uk-Site/en_GB/Login-Show?AID=13258517&PID=7924473&original=%2Fon%2Fdemandware.store%2FSites-buildabear-uk-Site%2Fen_GB%2FWorkshopRewards-Show&partner=CJ
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