how can you be sure there is no ash cloud at 2000 or 3000 feet?
Iceland volcano ash is 'no threat to human health'
The UK Health Protection Agency (HPA) has said that the cloud of ash from Iceland's recent volcanic eruption is not a significant public health risk.
The plume of volcanic ash has grounded flights across the UK, but the HPA says that it is "trapped" in the atmosphere at high altitude.
Unless 2/3000ft is considered high altitude, that's how.
Besides, I haven't heard of any cordoning off of Snowdon, Scafell or Ben Nevis...yet.
