Google's Street View service has been available in 25 cities since last March, but the increased coverage makes an additional 210,000 miles of detailed mapping public.
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Despite featuring images visible only from public roads, Street View has attracted critics who believe the detailed street-level information could be exploited by criminals.
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The launch means the UK will catch up with other European countries - such as Spain, France, and Italy - which already boast nationwide coverage.
Because Street View images look best in dry, overcast conditions, Google said its biggest challenge in the UK was the weather.
Campaigner Alex Deane, director of Big Brother Watch, is concerned about the privacy implications of Street View after a number of people contacted him with their concerns.
He said: "For many, Google's Street View cameras are an upsetting invasion of privacy. People tend not to be asked whether they are comfortable with it coming to their town.
Google's street-level imaging service has been extended to cover more than 95 per cent of UK roads.
From Thursday, 360-degree pictures from Penzance to the Shetland islands will go online, encompassing nearly a quarter of a million miles of British roads.