Please see this definitive warning about
www.bitcoinexchangeltd.com from the Administrator of Bitcoinukforum. They are a scam. BUT NOT AFFILIATED OR ASSOCIATED with Bitcoin Exchange Ltd in any way.
http://bitcoinukforum.com/index.php?PHPSESSID=e5ecc8f8a8b5d4fe5b74b3a15b52310a&topic=86.msg100#msg100