Boris Johnson writes:
After nine months on the launch pad, Britain finally engaged the most famous ignition sequence in diplomatic history.
At 12.29 pm London time, the Prime Minister’s Article 50 letter was delivered in Brussels and the countdown began. After nine months of meticulous legal, technical and political preparation, the engines switched on and are today firing in an irreversible crescendo.
The referendum result has now started implementation. It is going to be a fascinating two years of negotiations. But the one certainty is that the United Kingdom is leaving the European Union.