Thanks @David_Bn - I can access mine on webmail - and 2 or the other three are shown there but won't allow me to change passwords - they say I have to contact you. No updated inboxes either - if that makes any sense!
When asked to sign in use the primary username for the account and once in click on Update settings > Account details and then scroll down to Manage other My Virgin Media accounts. That page should list all the additional accounts that are linked to the primary account with an option to delete them if no longer needed.
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