Virgin Media's cable network saw record levels of traffic on Wednesday September 17th, the day Apple launched its iOS 8.
Demand for the new operating system from iPhone and iPad users caused a ten per cent rise in peak download traffic compared to normal levels.
According to Virgin Media's network statistics, total data consumption between 6pm and midnight was over 5,900 terabytes.
With each iOS 8 update requiring 920MB of data, this was the equivalent of more than 600,000 downloads.
Martin Groundsell, Head of Broadband Access at Virgin Media, said the release of iOS drove more internet traffic than previous Apple updates.
"Even though the iOS 8 release has generated the biggest download day so far, our fastest customers have been downloading iOS 8 in as little as 61 seconds at peak times," he stated.
Mr Groundsell added that "no major problems" had been reported by the firm's customers.