Source: Commons divisions
UK Parliament · Commons Division 190 · 19 June 2018
284 Aye / 299 No · lost by 15 · 4 tellers (not counted) · 1 both
On an Opposition Day the largest opposition party chooses the topic of debate. The vote is symbolic, it doesn't change the law, but it forces the government to publicly take a position on the opposition's choice of question.
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 283 of the 284 Aye voters and 298 of the 299 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.