T-mobile contract details?

Im going on holiday to spain next week and am on a contract with t-mobile (flext 25). i have a £60 allowance but have been told that if you use it abroad it isnt charged the the allowance, it is charged separatly to the bill. can someone tell me if this is true or not? thanks for info.
Answer
Yeah im on the same package and no its not part of your allowance, neither is the internet on your phone.