Interesting times ahead. The Supreme Court has ruled that the triggering of Article 50 must be put to a vote in the Commons, rather than the PM doing so. This has led to many MPs coming out and saying that they'll be representing their constituencies and voting against it. This includes at least 60 Labour MPs who will be voting against Corbyn and party lines.
This doesn't necessarily mean that Brexit won't happen. The Tories will be tabling a bill by the end of the week that will see a lot of debate and likely numerous amendments before being passed.
https://www.theguardian.com/politics...-50-and-brexit