RT @AndrewSparrow: John McDonnell repeatedly refuses to rule out Labour holding second Brexit referendum - https://www.theguardian.com/politics/live/2017/apr/20/general-election-2017-corbyn-speech-greens-launch-politics-live?page=with:block-58f88e14e4b05b487c0e4125#block-58f88e14e4b05b487c0e4125
