Yep,

Scam. Nothing wrong with Western Union by the way (apart from the fees). I've sold some stuff on eBay and someone from outside the UK wanted me to ship to them (even though I said UK only).

They offered to pay by Western Union. I went to an agent got paid in Cash (it was a couple of hundred pounds I think).

Can't really scam cash...

Problem is, they arn't paying you by western union. They just want you to send them payment by it (so you can't scam them )

Just them you don't trust money orders and ask them if they could pay by Western Union instead and you would send them the excess payment back the same way.

Bet you don't hear from them again.

Zuber (Ex N810 owner)