London (CNN) The Brexit battle lines just got a lot clearer.

After two days of significant policy U-turns by both of the UK's main parties , and a series of votes in the House of Commons on Wednesday, things have changed quite considerably.

The most immediate and significant outcome of these votes is that the opposition Labour Party, assuming it doesn't break its word, now officially supports a second public vote on Brexit, after MPs rejected its alternative plan.

Wednesday was supposed to be the next big Brexit moment: Lawmakers were hoping for a second so-called meaningful vote on Theresa May's Brexit deal. But on Sunday, that vote was delayed until March 12.

This triggered Labour's announcement on Monday that it would support a second referendum, were its alternative plan rejected. In turn, that led to a big policy shift by Theresa May on Tuesday when she told the House of Commons that, should her deal fail on March 12, Members of Parliament would be given the opportunity to vote in favor of a no deal on Marcy 13, and (stay with us) should that also fail, a vote to request a delay to Brexit would follow on March 14.