Sadly Lloyds TSB are not liable. It is not their fault you were given the details of a fraud account.
However you could seek a court order requiring Lloyds to give you the details of the fraud account, the persons name and address.
You would need to complete form n244:
A Court would list this for hearing and decide whether to make the order.
If the court does and you get the details you can sue the fraudsters direct.
You will need a Solicitor for this though (I cant do it for you as this is a question and answer site).
You can find a Solicitor here:
They should attend Court for you. If you win then you can claim the Solicitor cost back.
Can I clarify anything for you about this today please?