I don't know what the standard for these types of power supplies in the UK but the N Am standard requires a throw away design. It looks like a class 2 supply and any short on the secondary should render the supply as garbage. it might be done with a fuse embedded in the primary winding or fuseable wire and an over temperature bead. Once they open you throw the supply away. The cases should not be openable. IE plastic welded but no screws.
