The UK parliament 'meaningful' vote on Brexit is Tuesday 15 January 2019, best guess on timing is around 1900 - 2100 GMT

Scanning around for various expectations. This via Capital Economics seems to be on point ( (in very brief summary):

  • The most likely Brexit outcome, for now at least, appears to be a delay of a few months beyond March
  • it is unlikely to become clear … how Brexit will pan out
  • We now put the likelihood of May's deal and a no deal Brexit both at around 25%. But some sort of "fudge and delay", which may include an extension of Article 50 during which a softer form of Norway-plus style Brexit is agreed with the EU, now appears to be the most likely outcome.

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Note -

Cap Eco don't give any opinion on trading GBP around the vote.

It would appear very likely that the vote will fail tonight, and that is being interpreted around the place a GBP positive. Maybe it is but the only guarantee (IMO) are wild swings. The market can remain batshit crazy longer than many can remain solvent, K?