Charged up during the day, the accessories can then be used at night as decorative light in the home.

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They can be used at night or outdoors in full daylight.

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Travel would be provided by a streamlined and refurbished underground system, which would also be used at night for transporting freight and goods into central London.

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The Hicks Gate roundabout at Keynsham used to be illuminated by a dull yellow sodium light at night but, under the 71 LED lights, the area can become almost as bright as daylight.

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Mr Shinde said that routes used often by women at night would be identified and patrolled at night by police.

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Certain materials that can be made to adhere to surfaces in regular lattices could be used to maximise the reflective properties of road signs at night.

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Dr Jones said that in areas where both illnesses are present "protection against mosquito bites should be used around the clock, including the use of mosquito nets at night".

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"Soap operas, which used to be the stuff of afternoon television, have moved upstairs and now run at night under the guise of newsmagazines, " Hewitt said.

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But at least it has now become as much a point of honour in Salzburg to show that one is not a stick-in-the-mud, as it used to be a mark of prestige to get hold of a first-night ticket at all.

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