The man responsible for reviewing Britain’s anti-terrorism laws called on Thursday for greater judicial oversight over data interception as ministers prepare legislation firming up the powers of security services following leaks by Edward Snowden. The move would be a way of “helping build the relationship” with US technology giants and could make it more likely they would comply with requests from British law enforcement agencies, senior lawyer David Anderson said. The Government wants to pass new legislation giving intelligence services and the police increased powers to monitor Internet and phone.