We have the financial ombudsmen for complaints, the FSA and international organisations regulating how we communicate information, the structure of our charges and the amount of money we hold in reserve to support our lending.

BBC: Man looking at a falling graph

If the regulating valves fail or if the cabin structure is breached (by a failure of a door or window for example) then the pressure in the cabin would suddenly drop to match the outside air pressure.

BBC: NEWS | Europe | Dangers of aircraft decompression