You've said that the money has been transferred to an account in UB. Assuming your own bank is not UB, then you bank simply would not be in a position to know who the UB customer is, not alone pass on their contact details. Banks have a legal duty of confidentiallity towards their customers.
However, if you are not satisfied with how your own bank is dealing with this then I suggest you ask for a copy of their complaints procedures and file a formal complaint. If you don't get your funds back then you will need to do this before taking any case to the Financial Services Ombudsman
Secondly I suggest you contact UB College green and ask them if they can identify the customer involved(if you know the dates involved, they should be able to), and then ask them to see if they will freeze the funds pending resolution. They probably won't but no harm in asking. If the UB customer is a corporate customer (and UB College Green is their largest branch for corporate customers), then even if they won't tell you who the customer is, ask them to ask the relationship manager in the branch to speak to the customer on your behalf.
Make sure you follow up with everything in writing so you have a full record of your actions if this does go to court
You could also contact IPSO and see if they can help. IPSO are the industry self regulatory body for payments and they lay down and enfore the "clearing rules" for cheque and electronic payments. They may be able to advise you as to some other options. for more information