UKIP: 484k (33%)
Tory: 433k (30%)
Labour: 206k (14%)
Green: 166k (11.5%)
Lib Dem: 160k (11%)
There were of course others, but all small numbers and mostly independent so not particularly pertinent as it stands
... WITH A HUGE CAVEAT OF THIS BEING EXTREMELY HYPOTHETICAL ....
... use the April "Open Europe" poll to make assumptions, especially re: Brexit Party
Tory: 435k (30%)
Labour: 304k (21%)
Green: 174k (12%)
Lib Dem: 174k (12%)
Brexit: 174k (12%)
UKIP: 131k (9%)
Change UK/TIG: 58k (4%)
So.. what use is boosting the Labour or Tory vote?