I have Safari 4 and it seems great. Only problem is I cannot open my Digital Banking Account as it only works with Safari 3. How can I revert back to this. Many thanks.
Use the uninstall package that came with Safari 4.
Before you uninstall, report the bug to Apple, maybe they can fix it..
Might want to try setting the user agent to Safari 3 to make it work. You can enable the Develop menu in preferences (Advanced tab I think).