David Allen Green, lawyer and legal correspondent of New Statesman, said: "The circumstances of the arrest of Mrs Thompson are concerning. In general terms, it is important that police and local authorities do not use 'breach of the peace' as the basis of arresting at will, especially when there are free expression and public accountability issues at stake. I hope this was not what happened with Mrs Thompson. On what we know, it seems alarming, illiberal and misconceived."