It's nothing to do with your bank. Their refusal to offer you a fresh loan is a result of the tightening of the banking rules by the Financial Conduct Authority.
Banks used to be able to offer loans based upon looking at a customer's income and only a limited number of their outgoings (such as mortgage payments). Under the new FCA rules, bank must now take into account all of of customer's outgoings (including things like gym and magazine subscriptions, charity donations, car breakdown insurance payments, etc). So far fewer loans are now being offered.
Further, the FCA has tightened up the rules on 'repeat loans'. That's largely as a reaction to the practices of 'doorstep lenders' (such as Provident), where it had become normal for them to automatically offer a new loan as soon as an existing one was paid off. The new FCA rules mean that offering repeat loans must now be regarded as an exception (requiring special circumstances to justify it), rather than as the norm. So, for many people, getting a 'repeat loan' will no longer be possible (both with doorstep lenders and with High Street banks).