Also on tonights programme, its a week since the Terror Attack on Westminster Bridge. Thousands gathered in a show of unity, remembering the dead and the injured. Well have more reaction and opinion to the Historic Events as the Prime Minister triggers britains exit from europe. Well hearfrom politicians and members of the public. Good evening and welcome to the bbc news at six. A hand delivered, six page letter with that theresa may has made history. Shes written to the president of the European Council, formally announcing britains intention to leave the eu a process that will see the end of four decades of membership that have shaped so much in our daily lives. The Prime Minister said britain would be able to make its own decisions but continue to have a deep and special relationship with the eu. For the European Union, the president of the council said this was not a happy day for either brussels or london but he added, his goal now was to defend the interests of the remaining 27 m