Here's some relevant data.
The restrictions imposed on freedom of expression are concerned with the following areas:
Obscene material
Indecent material
Behaviour on the grounds of race
Behaviour on the grounds of religion
The restrictions in these three areas are governed by the Obscene Publications Act 1959, the Obscene Publications Act 1964, the Indecent Displays (Controls) Act 1981, the Public Order Act 1986 and the Racial and Religious Hatred Act 2006.