i assume that someone with real knowledge will come explain this in a minute, but my understanding for now is that there are now 4 possibilities:

- they keep negotiating and find a new brexit deal before the deadline and pass it in parliament (lol good luck)

- they convince the eu to give them an extension on leaving (maybe)

- they just up and leave the eu without any kind of deal, which fucks over british trade and immigration for, like, a while (nobody seems to rly want this, but it's what happens if nothing else changes, so it's a real possibility)

- new referendum and hopefully a remain vote this time (seems unlikely? but maybe)