Households are facing a postcode lottery when it comes to getting the fastest broadband speeds, new research shows.
The broadband blackspot appeared on Uxbridge Road, in Feltham, where average speeds were recorded at just 1.03Mbps - well below the national average.
The survey carried out by uSwitch.com, which collected data over a six month period, showed the fastest average connection was in Sandy Lane, in Cannock, Staffordshire, with 72.86Mbps, allowing a two-hour HD movie to download in just eight minutes.
In comparison, the slowest speeds were suffered by residents of Williamson Road, in Romney Marsh, Kent, at 0.54Mbps where a home-owner could fly to the Bahamas and back in the time it takes to download an HD movie.
London has three streets among the fastest in the UK including Bulwer Gardens, in Barnet, where speeds are at 64.56Mbps; Byron Road, in South Croydon, with speeds of 60.23Mbps; and Dalrymple Road, in Brockley, with speeds of 48.9Mbps.
Norfolk racked up four of the slowest streets - the worst performing area, nationally.
The data, sourced from a million speed tests done by broadband users, showed evidence of postcode lottery even within the same county.
While Staffordshire boasts three of the top 30 fastest streets in the country, it also boasts two of the slowest in Stoke-on Trent and Burton-upon-Trent.
Generally, a third (34%) of the UK struggles with sub-5Mbps speeds, while just under a quarter (23%) make do with less than 3Mbps.
The survey of the UK's very quickest average connections also revealed a north-south divide where the north of England enjoyed twice as many speedy streets as the south.
However, the number of households enjoying superfast speeds is growing with more than a fifth (22%) of broadband users now getting average speeds of 30Mbps or more, up 15% from last year.
With older copper cables replaced by fibre-optic lines average speeds have increased.
Ewan Taylor-Gibson, broadband expert at uSwitch.com, said increasing public awareness of what was on offer could help tackle broadband speed deficits, while also calling for the "urgent" roll-out of superfast services to every corner of the UK.
Mr Gibson said: "On the UK's slowest street broadband speeds are so sluggish you could fly to the Bahamas and back again in the time it takes to download a film.
"Likely causes include the user's distance from the nearest exchange or issues within the properties themselves.
"Wireless connections can be affected by the thickness of walls, for example, but your broadband provider can usually offer a solution if that's the case.
"Superfast broadband is now available to more than three quarters of the UK, but nearly a third don't realise they can get it.
"We looked at which of the 30 slowest streets had superfast availability and, interestingly, 37% of them do, but residents have obviously chosen not to take up superfast services."