Cheers to all for your help and advice.
Thought I should bring this topic to a close and inform all who are interested of the "current" result.
After trying to talk to him and eventual removal of Internet connection, I managed to get a few, minor details from my friends lad.
Using what I had learned from him (and I'm afraid, a little eavesdropping) I discovered which church and when he was going to meet "Petey".
I am glad to say that he was suitably shocked to find that Petey was a misionary from the Church of Latter Day Saints and that he was in his early 30's.
Apparently my mate's lad was due to be baptised into the Mormon church and had been "advised" not to tell his family until after the event.
After speaking to an "Elder" and the lad I have managed to convince him that it would be best to postpone the baptism until after his parents return.
I must add that the missionary (Peter) has been spoen to by the "Elder(s)" and has appologised to the lad for misleading and pressuring as that is not the policy of the "LDS" and that the lad is still very much interested in joining.
All's well that ends well. (At least it ends in the hands of his parents)
Many, many thanks to you all.