Comments made by UK officials “that a total ban on wild animals in circuses might well be seen as disproportionate under the EU Services Directive ……” are interesting. The EU rules ensure services can be easily provided across borders. But there are of course valid reasons for exceptions to the rules and restrictions are allowed.
The Commission can never say in advance whether a law will be OK or not. Of course, Commission officials are standing ready to discuss the matter with the UK government.