Ther are a quite of a few 0044 cards around, just take your pick. Check out this link
http://www.prepaidgsm.net/forum/index.php?showtopic=957 I have personally bought from Geodesa.
http://www.globalsimcard.co.uk/ The reason for this was that I can directly deal with owner of the company, so no excuses on seller side that someone didn't hand him my message if something goes wrong etc.