We have just determined on your other thread that the account is NOT in your name, but a Trustee's name.
You need to contact the Trustee, not the Bank.
You will be wasting your time contacting the banks.
From the other thread it seems that luckyfigure (LF)knows the trustee. LF should contact the trustee. We also know from that thread that LF has no idea which bank it is and even if the bank was known I expect they would be reluctant to give him any info without the trustee's' permission