Thanks Zamar.

Yes, the Bible does speak of tongues at length, particularly within the Corinthian books. HOWEVER these tongues that Paul talks of are usually of the "angelic" kind I think, where there isn't actually a human language spoken. But Paul however mentions that they can be interpretted by people who have the interpretation of tongues.

The modern Church does believe the tongues spoken in Acts 2 differ as they are actual human languages recognised by foreigners within the vicinity-BUT I wondered whether as a matter of fact in the end they COULD have all been angelic tongues interprettable by the gift of interpretation.

Okay, I've probably explained that pretty badly.........I know...