Porn sites must have age checks,

Pornography websites must adopt age-restriction controls or face closure, the Conservatives say.

Culture Secretary Sajid Javid said the party would ensure under-18s were prevented from seeing adult content.

In a recent Childline poll, a tenth of 12 to 13-year-olds were worried they are addicted to pornography.

The plan is targeted at both UK-based and overseas websites and would be introduced if the Tories remain in power after the general election.

Experts have welcomed the idea but warned it would be difficult to implement.

The proposed system would be overseen by an independent regulator with the power to force internet service providers to block sites which failed to include effective age verification.

Also, providers who did not co-operate could be fined.