You've not properly read what I said was my problem. Virgin has me down (wrongly) as only having an Outlook .com email address (and even sends my bill statements to it instead of blueyonder). All my online attempts to reset my blueyonder password therefore end in me being told I cannot change my blueyonder email address.
The 'temporary' fix to the original 403 problem that Virgin chose, using Outlook, would (they said) only be for a few days) but that was over 2 months ago! It works up to a point but if I can't log into my blueyonder account directly then I could easily lose access to my emails for good.
Why do I have to accept this nonsense when it was Virgin who messed up my account in the first place? And they told me the original 403 problem was affecting lots of other customers as well.