Organisations and businesses are still scrambling to update their systems after cyber-security flaws were revealed in a widely-used programming language, PHP.

Websites around the world were taken offline on Wednesday and Thursday after the developers of PHP said "critical vulnerabilities" were found in the back-end language, used in web development for decades.

Researchers warned the "severe" flaws could expose millions of sites using it to potential hacks if left unpatched - and the UK government was among those to take some sites offline as a precaution.

There have been no successful attacks reported so far, but experts say any impact may take time - even months - to become fully apparent.

Downing Street said on Thursday "some" limited government services "may be offline" while security work was being carried out.

"The information I have is that 32 Government services are unavailable and four are partially unavailable," tech minister Baroness Lloyd of Effra told the House of Lords.

She attributed…