Although Raytheon would not give details of the height, speed and range of the UAVs, saying that data "sensitive", it did say that the Navy wanted tests to be as realistic as possible, suggesting that the aircraft were behaving in the way military planners would expect them to.

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"When I got to 200 pounds, I decided, well, 'Why don't I go for a weight that's a healthy weight range for my height, '" said Welch.

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The four-storey museum houses more than 12, 500 shoes from different cultures spanning 4, 500 years of history, including pairs of 16th-century Venetian platform shoes known as chopines (which range between 15 and 50cm in height, sometimes too tall for a woman to walk unaccompanied), bear fur boots worn by the Japanese samurai and golden stilettos by modern designer Manolo Blahnik.

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The aircraft was believed to have been flying at a height of 13, 000 feet in the rugged Queen Alexandra Range.

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They do include the regular wish for an unlimited stash of extra-filled mince pies although the individual requests range from an extra two and a half inches of height, a head guard with a built in radio playing Beyonce Knowles on repeat and a seasonal supply of "notgetintheicebathwheneveryoulike" cards.

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Many characteristics that are under genetic control (height in people, for example, or flavour and texture in chickens) vary over a range of values.

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The aircraft is believed to be at a height of 13, 000 feet near the top of Mount Elizabeth, part of the rugged Queen Alexandra Range.

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