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There are fears that historic aircraft from the Battle of Britain may not be able to make an appearance at regional events.
Historic aircraft from the Battle of Britain Memorial Flight (BBMF) have almost entirely been taken out of action over engine-related safety fears.
The planes are due to appear at the Clacton Air Show and the Aylsham show in Norfolk on Bank Holiday Monday.
A Lancaster bomber, two Hurricanes and three Spitfires are reported to have been grounded after the discovery of a technical defect.
Nigel Brown, Tendring District Council’s Communications Manager said they have been made aware of potential mechanical issues with the BBMF flight by Clacton Airshow’s Flying Director.
Organisers at the Aylsham Show said they were very much hoping the planes would make an appearance at their popular one day show.
The planes are operated by the Royal Air Force and based at RAF Coningsby in Lincolnshire. They are some of the last Second World War planes still flying today.
The BBMF's three remaining Spitfires use different engines but are reportedly also out of action due to other reasons.
Some of the planes were due to perform a display at the Weymouth Carnival on Wednesday.
In post on Facebook organisers said: "The Battle of Britain Memorial Flight have informed us that they have identified a technical defect with one of the aircraft which has lead them to ground all three aircraft ... The safety of the teams and public during displays is of paramount importance, hence why this call has been made by the display teams