- Covid forced complete shutdown of Everest last year, creating a backlog of climbers intent on tackling peak
- This spring Nepal issued record 408 permits worth about £3 million - despite most of the world on lockdowns
- Quarantine rules eased to promote rebound, but there were also no clear plans to test, isolate or contain virus
- The reopening coincided with deadly second wave of coronavirus, with more than 9,000 daily cases in May
- Comes amid fears of Nepalese variant thought to combine worst elements of the Indian and S. African strains

