A government initiative to provide every UK resident with 2Mbps broadband access will be a "massive challenge", says Point Topic.
The broadband analyst has revealed that more than 30 percent of homes in Northern Ireland and 26.9 percent of Welsh households currently can't achieve that speed.
In London, the figure drops to 1.2 percent, and according to Point Topic chief analyst Tim Johnson a number of large towns across the UK have "notspots" where speeds of 2Mbps can't currently be achieved.
UK-wide 2Mbps broadband was one of the major initiatives in the Digital Britain report, which was unveiled by Communications Minister Stephen Carter last month.
"We forecast that over 90 percent of UK homes could have broadband access in 10 years time, almost all with speeds of 32Mbps. But, in order to achieve this, the government needs to back the right technology and make sure conditions are favourable," he added.
Johnson revealed the think tank was in support of fibre cables to offer internet access in the UK as it "will provide the UK with a future-proofed network".
See also: UK broadband nears 100 percent