Ofcom has fined a porn company £1m for failing to put in place sufficiently robust age checks - the biggest penalty it has imposed so far under the Online Safety Act.

The Act makes it a legal requirement for websites that host pornographic material to put in place what the regulator determines to be "highly effective age assurance" to prevent children from being able to easily access explicit content.

Ofcom said AVS Group Ltd, which runs 18 adult websites, had failed to do this, so was being fined £1m, plus £50,000 for failing to respond to information requests.

AVS must now implement highly effective age assurance within 72 hours or face a daily additional penalty of £1,000 a day.

In addition to the AVS fine, Ofcom also announced that one "major social media company" was going through compliance remediation with its enforcement team.