BUT the main question is this:
*** How could such a vote result in a REMAIN vote? ***
A summary of the points is in this thread.
Pro-🇪🇺 - whoever you are, whatever your organisation is, you need to be welcome in the Remain campaign this time around. Build it like Yes 🏴 - a coalition of diverse organisations, each with their own messages and audiences.
700000 people🚶♀️🚶♂️ marched against Brexit in London in October. Get even half of these people campaigning and you have a massive grass roots campaign. Canvassing, street stalls, phone banks - these will be run by volunteers.
No more 🇬🇧 exceptionalism. UK has wasted 3 years of other EU States' time, so even being able to stay is exceptional. Then argue that the EU is a good in itself, not something to just tolerate.
Economic arguments did not work last time. The majority of the population does not accept the economic consequences of Brexit. So deploy an economic case only together with other arguments.
Forget red buses 🚌. Don't argue about £350m. Make a case to stay in the EU that stands on its own, why it is the best for every British person, for jobs, for the future of the country. Read Lakoff's "Don't Think of an Elephant"