Well I will give Ian Evans credit where it is due, he has found and sorted the problem. He emailed me the invoice which only showed I had paid £186 for the BCD and £46 for lead. He asked me to email him the credit card bill showing that I had paid £269. He then found the guy who had done the sale and discovered that he had only accounted for a trade price of the goods and the rest had not been recorded or accounted for. Some commission had been paid into the instructors account without his knoweledge as he received no paper work to say so. As far as he was aware it was a direct sale between me and ND which was transacted on my credit card. Ian said he will refund me the difference and for the £21 postage I paid he has aset up an account in my name to that amount and if I buy anything else from ND it will be at trade price.