Extinction Rebellion try to block Prime Minister's motorcade from reaching Parliament

The video discusses an initial plan to block a convoy by locking onto carriage gates. However, the plan was disrupted, leading to an alternative action of blocking the road instead.

What was the intention regarding the carriage gates?

What was the group's plan regarding the convoy?

What was the outcome of the group's attempt to get in the way of the convoy?

What prevented the group from getting locked onto the carriage gates?

What alternative route did the group take?