The latest updates and information are uploaded at the bottom of this page - please scroll down for the very latest situation reports...
The newly released Met Office five-day volcano ash cloud forecast shows a blanket of dense dust is expected to drift over most of the UK early next week, including London's airports.
The predicted cloud is said to contain concentrations of ash that â€śexceed acceptable [aircraft] engine manufacturer tolerance levelsâ€ť and could trigger airport and airspace closures.
The Icelandic Met Office has reported an overnight â€śearthquake swarmâ€ť beneath volcano EyjafjallajĂ¶kull, which resulted in a thick grey plume rising to between 21,000 and 24,000ft, heading south towards the UK.
In a statement on Saturday, the Met Office warned: â€śWinds are expected to blow mainly from the northwest for a time over the weekend with the risk of ash affecting some parts of the UK.
â€śHowever, winds are predicted to swing into a south westerly direction by the middle of next week, which would take most of any ash away from the British Isles.â€ť
A statement released on Saturday at 23.45 by National Air Traffic Services (NATS), stated: â€śA high density volcanic ash cloud is rapidly encroaching on Northern Ireland.
â€śAs a result, a no-fly zone has been imposed by the CAA in airspace over parts of Northern Ireland, however Belfast International and Dublin airports will remain open, from 0100 (local) to 0700 on Sunday 16 May.â€ť
Earlier, a statement released by Manchester Airport, said: â€śToday (Saturday 15 May), the Government has asked the Met Office to publish five-day forecast maps showing the possible location of the volcanic ash cloud.
"Until today, the forecasts available to the public only looked ahead as far as 12 hours because it is very difficult to predict what will happen to the wind direction beyond this.
â€śAlthough the new forecast maps show that ash contamination may occur again in UK airspace over the next three to four days, it is by no means a certainty and Manchester Airport remains fully operational.
â€śRestrictions to airspace are applied by NATS (National Air Traffic Services) and at the moment there is no reason to expect any flights from Manchester Airport to be affected.
â€śIf passengers who are planning to travel to or from Manchester Airport over the coming days are concerned about their flight, please check with your airline or check the airport website for official updates.
â€śThere is absolutely no official suggestion or predication that prolonged, continent-wide airspace restrictions will occur again.â€ť
On Friday, the UK's Civil Aviation Authority issued a guidance list for air travellers affected by the ash cloud, which can be found at www.clickgreen.org.uk or at http://bit.ly/cwbcnv.
Sunday 11am update:
Major UK airports including Manchester, East Midlands and Liverpool will be shut from 1pm on Sunday, May 16, as a high-density volcanic ash cloud sweeps down from Iceland.
A statement from the National Air Traffic Services (NATS) confirmed a UK no-fly zone would be introduced from 13.00 to 19.00 (local time) today but London airports would remain open.
The airports affected include all those in Northern Ireland, Scotland, the north of England and the midlands.
The 10.30 NATS update states: â€śThe CAAâ€™s no-fly zone required by the high density volcanic ash cloud will not affect London airports for the period 1300-1900 (local time) today.
â€śThe no-fly zone for this period has moved east to a line stretching from Prestwick on the west coast to Humberside on the east coast and south to a line just north of Birmingham. Airports which fall within the no-fly zone include all those in Northern Ireland, Ronaldsway, Prestwick, Carlisle, Manchester, Liverpool, Doncaster, Humberside, Leeds Bradford and East Midlands and some Scottish island airports including Campbeltown, Islay and Barra.
â€śThere are currently no other restrictions within UK airspace. According to information from the Irish Aviation Authority, Dublin will remain open until at least 0100 tomorrow (Monday) and Shannon until 2300 tonight.â€ť
A spokesman for Manchester Airport, said Sunday: â€śThe Met Office and National Air Traffic Services (NATS) have today placed restrictions on parts of UK airspace as a result of a high concentration of volcanic ash drifting across the country from Iceland.
"These severe restrictions will cause disruption to all flights to and from Manchester Airport between 13:00 and 19:00 today (Sunday 16th May). All passengers are advised to check with their Airline or Tour Operator before travelling to the airport this afternoon.
"Long range forecasts indicate that the ash cloud may cause further disruption into tomorrow but this is not certain. If passengers who are planning to travel to or from Manchester Airport over the coming days are concerned about their flight, please check with your airline or tour operator or monitor our website for official updates.
"There is absolutely no official suggestion or prediction that the prolonged, continent-wide airspace restrictions experienced in April are about to occur again.
"We would like to sincerely apologise to passengers travelling today for the inconvenience that this will cause."
Sunday 4.30pm update:
The latest high-density volcanic ash cloud is nearing London after Met Office forecasts predicted its would reach the skies over Oxford this evening as the UK's no-fly zone was extended until 01:00 on Monday morning.
The further spread of the ash cloud has now forced Birmingham and Norwich Airports to shutdown as the no-fly zones imposed by the Civil Aviation Authority (CAA) and the National Air Traffic Services (NATS) are extended.
A NATS statement on Sunday afternoon, confirmed: â€śFor the period 19:00 today (local time) until 01:00 tomorrow (Monday) Londonâ€™s main airports will still be clear of the no-fly zone imposed by the CAA due to the high density volcanic ash cloud.
â€śThe ash cloud continues to change shape and move further south to just north of Oxford during this period. This brings Birmingham and Norwich inside the no-fly zone in addition to those airports already affected. The northerly extent of the no-fly zone in England now includes Teesside, stopping just short of Newcastle, and tracking northwest in a line just north of Carlisle, which remains in the no-fly zone.
â€śAirports inside the no-fly zone in England and Wales now include Teesside, Humberside, Leeds Bradford, Blackpool, Ronaldsway, Caernarfon, Liverpool, Manchester, Sheffield, Doncaster, Norwich, Birmingham and East Midlands.
â€śIn Scotland the no-fly zone includes the Western Isles, Campbeltown, Prestwick and Oban. All airports in Northern Ireland remain inside the no-fly zone during this period.
â€śThere are currently no other restrictions within UK airspace.â€ť
Sunday 11pm update:
The UK's National Air Traffic Services (NATS) has tonight confirmed London's two main airports, Heathrow and Gatwick, will be closed until at least 7am Monday morning as airports in Northern Britain are allowed to reopen.
In addition, London City Airport will also be affected although London Stansted has confirmed it is to remain open.
A NATS statement issued at 22:45 on Sunday, confirmed: â€śFor the period 0100 (local time) until 0700 tomorrow (Monday), airports inside the no-fly zone as imposed by the CAA, include; London Heathrow, Gatwick, Farnborough, London City, Shoreham, Biggin Hill, all airfields in Northern Ireland, Scottish Western Isles, Oban, Campbeltown, Caernarfon and Aberdeen. Cardiff remains open but operations may be limited due to close proximity of the no-fly zone.â€ť
A spokesman for Manchester Airport, said tonight: â€śThe CAA (Civil Aviation Authority) has confirmed that airspace across Northern Britain will reopen at 01:00 tomorrow (Monday 17 May).
â€śThe lifting of todayâ€™s airspace restrictions applies until 07:00 by which time the forecasts for the day ahead will allow the authorities to provide a further update for passengers.
â€śManchester Airport will therefore reopen from 01:00 on Monday 17 May 2010 and remain operational unless there is a further deterioration in conditions.
â€śIt is absolutely essential that people contact their airline before travelling to the airport for any flight because there are still high levels of ash contamination above parts of Britain which may bring further disruption.
â€śThere is absolutely no official suggestion or predication that the prolonged, continent-wide airspace restrictions experienced in April are about to occur again.
â€śWe would once again like to thank passengers for their continued patience and understanding since this situation began yesterday.â€ť
Sign up to follow the latest breaking news at twitter.com/greensourcenews