London would lose both jobs and revenue to other financial centres if the government remains fails to achieve a transition deal in time.
Shares in the owner of Madame Tussauds and Alton Towers tumbled in early trade as it revealed the impact of recent terror attacks on trading in the UK.
The Government has announced proposals that would allow it to intervene in mergers and takeovers that raise national security concerns.
Bombardier has won contracts worth �680m to build more than 100 trains as part of a �1bn investment in the West Midlands train network.
Aircrafts have been forced to turn around midway into flights, many being met by firefighters on arrival at terminals, due to the smoke smells in cockpits.