Tesco today denied it has been approached by government data security chiefs over alleged flaws on its website – but promised to make improvements to its online security following “feedback” from shoppers.

The Information Commissioner’s Office yesterday said it was investigating claims of “lax security” on Tesco.com that potentially left customers’ information vulnerable to internet hackers.

That followed concerns raised by technology bloggers claiming poor basic security practices at Tesco make it an easy target for criminals.

“We have not had any contact from the ICO [but] would of course cooperate fully with any requests they may have,” a spokesman for the supermarket said today.

“We review our systems on a regular basis and look to update them if necessary. Following feedback from some of our customers, we will be updating the measures we already have place in the coming weeks.”

The ICO has the power to issue companies with enforcement notices or fines of up to £500,000 if they are found guilty of data protection lapses.