[bbc] About three million homes in the UK have broadband speeds of less than two megabits per second (2Mbps) according to research commissioned by the BBC.
The government has promised to provide all homes in the UK with speeds of at least 2Mbps by 2012.
The research revealed that so-called notspots are not limited to rural communities, with many in suburban areas and even streets in major towns.
The government has pledged a range of technologies to fill the gaps.
"We had assumed that these notspots were in remote parts of the countryside. That may be where the most vocal campaigners are but there is a high incidence of them in commuter belts," said Alex Salter, co-founder of broadband website SamKnows.
UK broadband 'notspots' revealed
see also Broadband performance maps