After historic week, Brexit dawns a shade warmer

By Alastair MacdonaldBRUSSELS (Reuters) - The week Britain filed for divorce from the European Union brought relief in London and Brussels that crockery was not smashed - far from it - but negotiators fear tantrums or even a breakdown once talks start.As the fateful day approached for May to trigger Article 50 of the EU treaty and launch an unprecedented exit that Brussels wants to ensure remains a one-off, officials on both sides privately sounded increasingly worried the process could work.