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With time, she said she hopes to restart her virtual book club series and sell books on her own website.

After 14 months they were finally preparing to restart 3D printing when Qaradaya spoke with Salon in December.

The Palace said the King's schedule of public duties - which restarted last April after a period of treatment and recuperation following his diagnosis - is expected to resume next week.

"Given Heathrow's size and operational complexity, safely restarting operations after a disruption of this magnitude was a significant challenge," a spokesperson said on Monday.

Mr Woldbye told the BBC the delay to reopening was due to the need to "reallocate" the power supply - "closing down and restarting systems which takes a long time."