Before the 2016 referendum on British membership of the EU , Hopkins signed the People 's Pledge , a cross-party campaign for such a referendum .
Before the 2016 referendum on British membership of the EU , Hopkins became a member of its Advisory Council .
Before the 2016 referendum on British membership of the EU , Hopkins signed the People 's Pledge , a cross-party campaign for such a referendum , and became a member of its Advisory Council .