I say Big Ben, what I mean is St Stephen’s tower.
The BBC are projecting an unbranded bar chart of the results as they come in and it “will feature a “winning line”, representing the 326 seats that any party will need to win to be sure of an outright victory”
It’ll provide a count of the number of seats won by the main three parties as well as those won by smaller parties and independent candidates.
It’ll be up until around 0530am on the 7th.

Here’s more info on the BBC site.