Interesting calculation, thank you for sharing some of the "magic" behind the scene in ebay, learned something new
Looking back today I realised I made an error, the sale amount after fees would have bought 0.69
BTC then. Today, that has fell to 0.6588
BTC (@ £404.10 on localbitcoins)
Hope your buyer pays up fair and square dave3k because they got a good deal!