But if you're visiting someone after 18:00, you stay with your host rather than venture back out - a sense of caution is hanging over Damascus.

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It added the captain believed the crew had been interrupted pre-flight by someone visiting the flight deck, which had distracted them.

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You walk from room to room like someone visiting a deserted town.

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Not so for someone visiting a therapist.

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Citing the example of someone visiting the Alcoholics Anonymous website, he said sensitive information was at risk of being compromised if details of online behaviour were stored on a database and then a laptop containing information was left in the back of a cab.

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Lee posed a simple question: When was the last time someone enjoyed visiting a doctor?

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For instance, tourists visiting a cemetery or religious site may want to take a photo of someone in a clearly emotional state.

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"If someone has been living with someone for 15 years there is no way of identifying, for example, visiting rights in hospital, " he said.

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