Airports had already discovered reinforced autoclaved aerated concrete (Raac) prior to considerable media coverage of its use.

Heathrow claimed it had the resources to maintain the airport secure until “permanent solutions” can be implemented.

Gatwick has stated that it has found no cause for alarm.

The discovery of crumbling concrete in schools and public buildings has resulted in a number of closures since the beginning of September.

The chemical was discovered inside Heathrow Terminal 3 last year, and the airport has taken precautions to ensure its safety.

Since the discovery of the Raac concrete at Heathrow, the airport has reviewed and approved its management plans.

According to a representative for Heathrow, the airport is “assessing our estate and will continue to mitigate the risk where this material is found.”

Gatwick has conducted frequent concrete inspections and is unconcerned about the results.

According to a Gatwick spokeswoman, “we have a register of locations containing Raac on the airport campus, which are closely monitored through a regular comprehensive structural inspection regime.”

The most recent Gatwick inspection took place in June and “did not reveal any issues.”

Gatwick will continue to check the Raac on a regular basis, according to the spokeswoman.

According to a representative for Manchester Airport, regular inspections discovered no Raac on site, and the airport was conducting another inspection to double-check.