The let-out clauses attached to the European Convention on Human Rights are so comprehensive and catch-all that an EU government, including UK, can apply them any time it so pleases to suppress a Human Right with the help of police.

For example, Freedom of Assembly, which vitally affects public demonstrations, has the follow sections attached...

"(2) No restrictions shall be placed on the exercise of these rights other than such as are prescribed by law and are necessary in a democratic society in the interests of national security or public safety, for the prevention of disorder or crime, for the protection of health or morals or for the protection of the rights and freedoms of others.

This Article shall not prevent the imposition of lawful restrictions on the exercise of these rights by members of the armed forces, of the police or of the administration of the state."

Add to this the application of anti-terrorism laws and what started out looking like a Human Right is seem to become something which may or may not be tolerated by authority any time at its whim.

The Universal Declaration of Human Rights, which is not compulsory on a government anyway, is almost as bad except that it does not include national security...

"In the exercise of his rights and freedoms, everyone shall be subject only to such limitations as are determined by law solely for the purpose of securing due recognition and respect for the rights and freedoms of others and of meeting the just requirements of morality, public order and the general welfare in a democratic society."

So a government has only to formulate some obscure law to use against Freedom of Assembly and job done.