The poll company tweeted this 51 minutes ago 20 May 2016
Hats off to reader Enric for spotting it.
The question now is how much of the bombshell ( bias toward Leave?) is factored in/known given the earlier poll-related wobbles.
Posting for info not trading advice.
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Update :
Relax everyone. Here's the "bombshell". Zzzzzzzzzzzzzzzzzzzzzzzzzzzzzz