LVAAC

London Volcanic Ash Advisory Centre
Met Office
Fitzroy Road
Exeter EX1 3PB
United Kingdom

Contact details: see website below

Website https://www.metoffice.gov.uk/aviation/vaac 

Overview of London VAAC

The London VAAC is responsible for monitoring and forecasting the movement of volcanic ash over the United Kingdom, Iceland and the north-eastern part of the North Atlantic Ocean.

Although this is a relatively small area, it covers some of the busiest airways in the world. A volcanic eruption on Iceland can quickly affect a large area of airspace, as strong winds spread the ash downwind from the volcano. Air traffic control organisations need to react quickly to the forecasts issued by the VAAC so that aircraft can be diverted onto alternative safe tracks.