Gentlemen. Thanks for the answers. I will pass the model numbers onto him (from the description/spec. it presumably must have been the AS355 I read about). I would also point out:-
1. It wasn't a wind-up, or at least not of yourselves. It may well never happen for a variety of reasons (cost or mate was being wound up) but the conversation was serious.
2. He did mention the licence type, and whether he would need a commercial licence. His boss is also a personal friend of his. I don't know what the rules are but I would imagine you can let your mate have a go in your aircraft, which would give him an 'exemption' (please note ironic quote marks), as per Helinut's comments.
3. I'm not a pilot of any sort and didn't know the 206 was a single and that police/medevac aircraft were twins. He was ranting on about the Bell and I remembered the French things and thought that if it was good enough for the police/medevac it should be good enough for him, but couldn't remember the name. Similarly I didn't know the prices (he was talking a budget of 800k USD for the initial purchase).
4. The conversion course he was talking about will involve 3 months in Texas. I don't know the syllabus but sounds like longer than just a basic PPL type thing.
Thank you again gentlemen.