Mr Swire called for a UK regulatory body for websites, which he dubbed the "internet standards authority", which would create the database of blacklisted sites and update this hourly.
This could work "along the lines of the Advertising Standards Authority or the Press Complaints Commission", and would be responsible for policing "harmful content" online.
Among the sites coming into this category would be "glorification of violence and terrorism, pornography, cyber-bullying, suicide, internet gambling and anorexia websites", Mr Swire added.