Foreseeable future' Eurocontrol, which covers 38 nations across Europe, said the ash ejected by the volcano underneath the Eyjafjallajoekull glacier in Iceland would continue to move in a south-easterly direction. We can actually smell sulphur in the air here now from the volcano cloud Tim Farish, Oslo Volcanic ash: Your travel stories UK extends air restrictions A guide to Iceland's volcanoes Based on the guidelines of the International Civil Aviation Organisation, normal air traffic control services could not be provided to flights in airspaces affected by volcanic ash, requiring the temporary suspension of air traffic, it added. Experts have warned that the tiny particles of rock, glass and sand contained in the ash cloud could be sufficient to jam aircraft engines. Mr Flynn, Eurocontrol's assistant head of operations, said the extent of the disruption was "greater than we've ever seen before in the EU" and warned that the problem could persist for a further 48 hours. "The meteorological situation is such that the volcanic ash is progressing very slowly eastwards but there is not a lot of wind... so it is very slow and very dense," he told the Reuters news agency. COUNTRIES AFFECTED Airspace closed: UK Republic of Ireland Norway Denmark Sweden Belgium Netherlands Finland Partial or planned closures: France (northern airspace) Poland (northern airspace) A spokesman for the UK's National Air Traffic Service (Nats) said its airspace restriction was the worst in living memory, and that it was "very unlikely that the situation over England will improve in the foreseeable future". The restrictions will not be lifted before 1300 (1200 GMT) on Friday at the earliest. The move silenced Heathrow airport, the world's second busiest, and stranded tens of thousands of passengers around the world. The Republic of Ireland, Norway, Denmark, Sweden, Belgium, the Netherlands and Finland all later shut down their airspace entirely, while there was also major disruption in France, Germany, Poland and Spain. The Norwegian and Belgian authorities said their airspace would remain closed for most of Friday. Half of all transatlantic flights are expected to be cancelled. Tim Farish, who had been planning to fly from Oslo to London on business, told the BBC he had been told by the airline SAS to stay at home and not bother calling for updates. Advertisement Stranded passengers in Paris, Stockholm, Dublin and Oslo "We can actually smell sulphur in the air here now from the volcano cloud," he told the BBC from his home in the Norwegian capital. "This could last for a few days apparently, so all I can do, like anyone else, is sit and wait." 'Days or weeks' The volcano beneath the Eyjafjallajoekull glacier began erupting on Wednesday for the second time in a month, hurling a plume of ash 11km (seven miles) into the atmosphere. A 500m-wide fissure appeared at the top of the crater. The heat melted the surrounding ice, and witnesses said two flows of meltwater started coming off the glacier on Wednesday. As many as 800 people were later evacuated from their homes as water carried pieces of ice reportedly the size of small houses down the mountain. A road along the flooded Markarfljot river was also cut in several places. Advertisement Ash spewing from the volcano in Iceland on Wednesday On Thursday, the flooding was reported to have subsided, but the volcano was still producing ash that was being blown towards Europe. "It is likely that the production of ash will continue at a comparable level for some days or weeks. But where it disrupts travel, that depends on the weather," Einar Kjartansson, a geophysicist at the Icelandic Meteorological Office, told the Associated Press. "It depends how the wind carries the ash." The last volcanic eruption beneath the glacier was on 20 March. The eruption before that started in 1821 - and continued for two years. Iceland lies on the Mid-Atlantic Ridge, the highly volatile boundary between the Eurasian and North American continental plates.