British-German musician Simon Wallfisch (C) poses playing the cello with supporters outside Europe House in Smith Square in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched to Downing Street performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) poses playing the cello with supporters outside Europe House in Smith Square in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched to Downing Street performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) poses playing the cello with supporters in Smith Square in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched to Downing Street performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (L) poses playing the cello with supporters in Smith Square in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched to Downing Street performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) plays the cello and sings with supporters and fellow musicians outside the Houses of Parliament in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - Classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched past the Houses of Parliament performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) plays the cello and sings with supporters and fellow musicians outside the Houses of Parliament in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - Classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched past the Houses of Parliament performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) plays the cello and sings with supporters and fellow musicians outside the Houses of Parliament in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - Classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched past the Houses of Parliament performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) plays the cello and sings with supporters and fellow musicians in a street in central London en route to the Houses of Parliament in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - Classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched past the Houses of Parliament performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) plays the cello and sings with supporters and fellow musicians in a street in central London en route to the Houses of Parliament in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - Classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched past the Houses of Parliament performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) plays the cello and sings with supporters and fellow musicians in a street in central London en route to the Houses of Parliament in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - Classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched past the Houses of Parliament performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)

British-German musician Simon Wallfisch (C) plays the cello and sings with supporters and fellow musicians outside the Houses of Parliament in London on January 10, 2019 during a permormance to protest Britain's exit from the European Union (Brexit). - Classical singer and cellist Simon Wallfisch, whose family were persecuted by the Nazis, recently applied for and recieved German citizenship because of Brexit. Since the UK invoked Article 50 starting the countdown to Britain's exit from the European Union Simon and a group of supporters have once a month marched past the Houses of Parliament performing Beethoven's Ode to Joy as a muscial protest against Brexit. (Photo by Adrian DENNIS / AFP)