I set a bid for the above item. I set my price for £266.66, but the item sold to someone else, for £202.66.
I made sure everything was correct and in order.
I am very unhappy about this. Can you tell me what happened, why it happened and what can be done about it ?
Thank you.

Hello Simon,
Thank you for your question about your snipes. On your Completed tab it explains the outcome of each snipe and the reason.
The error we received on each was, "This Token has been revoked by App." This means you changed your password and have to re-authorize us to bid for you. There is no way to check for this easily before the auction, unfortunately.
To remedy this, please go to BidSlammer Preferences and choose the Authorize button.
We hope we have explained this to your satisfaction. Please advise if we can help with anything else.