Finally they have changed the Forgotten Username Page and retreival method.
Click on this link to retreive your username/password https://giffgaff.com/support/lost-password
But there is a flaw, if you no longer have access to the email address or there was an error in the input of the email address it's still of no use.
The best option would be to enter your mobile phone number (for the account in question) and the details be sent to that.
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