Outside Kabul, too, Taliban leaders may have decided to swap set-piece battles for hit-and-run attacks.

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Doherty points out that pay-TV subscribers also stand to benefit from lower energy use if they can swap their set-top boxes for devices without hard drives that connect to remote storage servers.

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The currency swap lines that central banks set up among themselves have also been shut down.

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Cheltenham are understood to be hoping to set up a swap deal with Southend for Robins striker Steven Gillespie - and Hooper is now considering his options.

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Now, some services are starting to bring in the ability to swap SMS messages between phones and set-top boxes.

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Users can swap files, send friends invitations to download the program or set up Internet telephone calls.

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At the RNIB's first ever Swap With Me event, Mr Baker experienced for himself the problems passengers face as he wore a special set of glasses mimicking the effects of being partially sighted.

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