Source: Commons divisions
UK Parliament · Commons Division 406 · 3 April 2019
220 Aye / 400 No · lost by 180 · 4 tellers (not counted) · 4 both
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 215 of the 220 Aye voters and 396 of the 400 No voters; tellers are listed and marked but not counted.
Walking through both the Aye and No lobbies is a recorded form of deliberate abstention.