Hi, I too have been scammed by this B*****D!!!
My Postal order has been cashed, try to cancel yours by calling 01246 542091 you will need your reciept to tell them the voucher ID.
Contact Baker Street Police Station on 020 83631212 they are aware of this scam and are investigating. They will give you a crime number, you may need this to cancell your postal order
Register your interest. you may be able to claim your money back if they are caught.
This is an ongoing investigation please. contact the police, he has done this before. Lets try to stop him
Please let me know how you get on