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Only putting blank or Administrator or Admin as the username and the
new (or old) password as the password doesn't get me in!

It's a pretty unique password, and being as it had to be entered
twice, I can't see that I can have typed it wrong.

Anyone know of any wierd behaviour with these routers with regard to
passwords?

Should I be using a different username?

Any ideas?

Virgin suggested a hardware reset, but i'd rather not go down that
route If I can avoid it.

did you try 'Admin' in lower case?