Kemi Badenoch, the Conservative leader, is due to respond to the Budget at 1:30pm, according to the afternoon schedule in LBC's live blog.
LBC also says the Office for Budget Responsibility will hold a news conference at 2:30pm.
Both times come from LBC alone. Neither the OBR nor Parliament has confirmed them.
LBC's schedule has the Chancellor, John Healey, starting his statement at 12:30pm. That is the same time reported earlier today.