Airlines review safety procedures after Germanwings disaster
With that, the Civil Aviation Authority (CAA) said that they have got in touch with all the British airlines "to require them to review all relevant procedures".
The details of the crash in the Alps are well documented, so you'll know that, in the lead-up to the crash, Andreas Gunter Lubitz waited until the captain of Flight 4U 9525 left the cockpit and then crashed the aircraft into a mountain range.
Post 9/11, the US Federal Aviation Administration (FAA) brought in rules which require a member of the cabin crew to enter the cockpit if the captain or first officer needs to leave for some reason. These rules weren't put in place across Europe.
The CAA said: "Following the details that have emerged regarding the tragic Germanwings incident, we are co-ordinating closely with colleagues at the European Aviation Safety Agency (EASA) and have contacted all UK operators to require them to review all relevant procedures."
"All UK airline pilots undergo extensive and regular medical assessments to determine their fitness to hold a licence. As part of this, aeromedical examiners are required to assess a commercial pilot's mental health at each medical examination which, for an airline pilot flying with at least one other pilot, is undertaken annually."
Virgin, Thomson, Monarch and Easyjet have said that they'll be bring in the procedure immediately and Ryanair, Jet2 and Flybe already undertake this system.