The Scottish government has proposed banning wild animals in travelling circuses. In the same vein as a proposed ban by the British government, they have said that they wish to ban wild animals in circuses based on ethical considerations although this premise has already been open to criticism by at least one academic ethicist.
In the case of a British ban, they chose to go down the ethical route because research by DEFRA in 2007 came to the conclusion that banning circuses with animals in could not be undertaken on welfare grounds. However, in December 2012, the British government decided to introduce legislation which involved the inspection and licensing of circuses with wild animals and any plans for a ban have now faulted. Likewise, the Welsh assembly investigated a ban of wild animals in circuses. However, it seems likely that the Welsh assembly will follow the British example of introducing an inspection and licensing scheme.
I have made clear my personal feelings that I would prefer regulation of animals in circuses which a number of countries have undertaken. Some backgrounds on my position can be found in the blog linked below.