Businesswoman and campaigner Gina Miller, known for leading two successful landmark legal challenges related to the Brexit process, said she hopes that Britain's next leader will have "a plan" for the UK's future relationship with Brussels, hours after Prime Minister Keir Starmer announced he would resign. ADVERTISEMENT ADVERTISEMENT The British-Guyanese 61-year-old became one of Britain's most divisive political figures after she took the successive Conservative governments of Theresa May and