Ordering Premium Email and BT ID

Question

Hello,
A few days ago, I received a BT email informing me I had just 30 days to keep my btinternet.com email addresses, either by switching ISP to BT Broadband or signing up for BT Premium Mail.
I have a primary email account and several sub-accounts (used for 10+ years), so will plump for Premium Mail but am confused about the ordering process.
It appears to require a 'BT ID': 
1) If I already have a BT ID (we have a BT landline), should I use this?
2) If yes, should the BT ID Username (email address) match the primary email account? 
(my existing BT ID username/email is a sub-account of my primary email address.)
3) Alternatively, could I create an additional BT ID (just for Premium Mail) or would this cause a problem? i.e. are multiple BT IDs at the same address allowed?
(I did speak to somebody in the Indian Call Centre - 0808 100 6778 - but they were not able to assist).
Thanks for any help!

Answer 1

I went through the screens to order Premium Mail and entered:
- Start Order: Login Details = primary btinternet.com email address
- Personal Details: Contact Details = existing 'BT ID' username (i.e. a sub-account btinternet.com email)
- On reaching the 'Billing and Payments' screen - setting up a 'Direct Debit'
The screen rejected my Joint Account Name as it contains an ampersand (&) symbol, e.g. 'A & B SURNAME'
This is strange, as I thought '&' is a commonly used symbol for joint account names? 
At this point I cancelled out of the order.
So:
1) Can I pay for Premium Mail with a different bank account (single holder) to the one used for my existing BT phone line? An earlier screen had stated that 'any monthly charges will be added to your regular BT bill'
i.e. does 'myBT'/Billing allow different BT services to be paid from different bank accounts?
or 
2) Can I enter a slightly different account holder name on the DD screen to get through the validation? e.g. 'A AND B SURNAME' (rather than 'A & B SURNAME')