Hi Andy thanks for your reply.
There is only one named account holder for our services - if you requested a name change on your My Virgin Media account so your partner could become the main account holder, then when the account in question is logged into on My VIrgin Media, it will say who the account is registered under.
If you mean adding your partner as a "secondary name" onto the account as such, this isn't something we do at this moment in time unfortunately, but hopefully this provides you with some clarity.
Please don't hesitate though to let me know if you need any further help!
Many thanks
Tom_W