BBC News - Ash ban to remain for most of UK
Nats has allowed for "overflights" - flights that pass over UK airspace at an altitude above 20,000 feet - allowing for many flights between Europe and the Middle East and North America.
Clearly, the BBC doesn't believe that NATS is an acronym.
Bearing in mind that flight beneath FL200 was condidered hazardous, what would have been the safe procedure for handling an emergency descent? I'm thinking in terms of, say, a pressurisation loss.
I asked the question on R&N but it was either too stupid or too difficult.