Communications regulator Ofcom has published information on which broadband providers best meet its voluntary code on connection speeds.
According to ISPreview.co.uk, research from the body revealed that just 43 per cent of the UK's major broadband providers informed potential customers of the speeds they can expect without prompting.
O2 was found to perform best on that issue, while BT recorded the worst result.
In addition, the Ofcom figures revealed that a fifth of shoppers failed to get similar information when looking to purchase products from providers' websites.
Sky and Virgin Media were the worst performers in this area, with the companies failing to offer connection speed information to 30 per cent and 35 per cent of shoppers respectively.
The release of the figures has come after research by uSwitch.com named O2 as the broadband provider with the best customer service record in the UK for the second consecutive year.