Source: Commons divisions
UK Parliament · Commons Division 68 · 13 December 2017
309 Aye / 305 No · majority 4 · 4 tellers (not counted) · 1 both
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 308 of the 309 Aye voters and 304 of the 305 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.