The U.K. may overturn its decision to exit the European Union unilaterally, that is without approval of EU member states, according to the advocate-general of the European Court of Justice. The top legal official, Campos Sánchez-Bordona, however said that the decision had to be made within two years of triggering article 50, which would be in March 2019. Embattled U.K. Prime Minister Theresa May is meanwhile still working up support for the Brexit deal she agreed to with the EU last month. This will come to a head on Dec. 11, when the British parliament will vote on it. The British pound rallied on the back of the news, which is seen as a win for the 'remain' camp. Sterling last bought $1.2804, up from $1.2723 late Monday in New York. The euro-pound pair was 0.3% weaker, with one euro buying £0.8897.