Source: Commons divisions
UK Parliament · Commons Division 246 · 25 April 2016
294 Aye / 276 No · majority 18 · 4 tellers (not counted) · 2 both
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 292 of the 294 Aye voters and 274 of the 276 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.