We are driven around a site with an interesting collection of buildings, from standard plate-glass towers, to lakeside villas where customers are entertained, and on to what appears to be a replica of the White House.

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Ms Palmer said that there was no gold plate standard and that efficiency is hard to achieve in older properties, adding that there are already tighter standards of efficiency in Wales than in England.

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At this point, the app can only identify certain foods, and only provides calorie results for standard portions (it can't tell the difference between a plate and bowl of pasta, for example).

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