The UK government says Elon Musk's platform X limiting Grok AI image edits to paid users is insulting to victims of misogyny and sexual violence.

Speaking on Friday, Downing Street said the move simply turns an AI feature that allows the creation of unlawful images into a premium service.

It follows significant backlash after Grok digitally altered images of others by undressing them - something it says it now can only do for those who pay a monthly fee.

However, it has no such restrictions when accessed through its edit image functionality, separate app or website.

The BBC has approached X for comment.

The prime minister's official spokesperson told reporters on Friday it showed X can move swiftly when it wants to do so.

They said it was abundantly clear that X needs to act and needs to act now.

It is time for X to grip this issue, if another media company had billboards in town centres showing unlawful images, it would act immediately to take them down or face public backlash, they added.

The Liberal Democrats have called for access to X to be temporarily restricted in the UK while the social media site is investigated.

Musk has thrown his toys out of the pram in protest at being held to account for the tsunami of abuse, said Professor Clare McGlynn, an expert in the legal regulation of pornography, sexual violence and online abuse.

Instead of taking the responsible steps to ensure Grok could not be used for abusive purposes, it has withdrawn access for the vast majority of users.

Hannah Swirsky, head of policy at the Internet Watch Foundation, emphasized that the changes do not undo the harm which has been done. Sitting and waiting for unsafe products to be abused before taking action is unacceptable, she said.

Grok is a free tool which users can tag directly in posts or replies under other users' posts to ask it for a particular response. However, its image editing features previously allowed harmful requests, which have now been restricted to paying users.

Critics argue this is not enough. Charities say it represents the monetization of abuse and there needs to be a proactive approach to prevent such situations in the future.

Calls for regulatory action against X are gaining momentum, with demands for regulators like Ofcom to use their powers to restrict access until a comprehensive investigation is conducted.