Source: Commons divisions
UK Parliament · Commons Division 219 · 17 July 2018
248 Aye / 316 No · lost by 68 · 4 tellers (not counted) · 1 both
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 247 of the 248 Aye voters and 316 of the 316 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.