The Scottish government today formally asked British Prime Minister Theresa May for a second referendum on independence, deepening a constitutional crisis sparked by the Brexit vote.<br/>'<br/>First Minister Nicola Sturgeon wrote a letter to May telling her that Scotland did not want to leave Europe's single market, two days after Britain launched the process of leaving the European Union. Sturgeon, leader of the ruling Scottish National Party, said in the letter that the people of Scotland must have the right to choose our own future.<br/>'<br/>Scotland voted to remain in the EU in last year's referendum but Britain as a whole voted to leave. On Tuesday ,the Scottish Parliament voted by 69 votes to 59 for another referendum, but it cannot hold a legally-binding vote without London's approval.