I bought £60 of Tesco Clubcard vouchers for Pizza Express. The email delivered them to me as two £30 vouchers, which isn't unusual - I've looked back at past orders and there are always multiple vouchers. However, when my son tried to use the vouchers for a birthday meal with his friends, the waiter told him he could not "stack" multiple vouchers so could only use one of them. Is this a change of policy, or did the waiter get it wrong? I know it's not possible to use different types of vouchers or special offers on the same meal, but surely the two £30 Tesco vouchers should have been counted as one £60 voucher?