Can i use more than one gift voucher at hmv per transaction?

For Christmas and my birthday I got given 5 different HMV gift vouchers. i wondered if i can use all 5 during one transaction when buying in store.Can i use more than one gift voucher at hmv per transaction?
I didn't know that HMV was still in business. They were so overpriced that we always said that HMV stood for ';Hear Money Vanish';.





If they don't let you use all 5 in one transaction then do multiple transactions.Can i use more than one gift voucher at hmv per transaction?
what is hmv. usually you can use only one per transaction.