Source: Commons divisions
UK Parliament · Commons Division 247 · 25 April 2016
304 Aye / 268 No · majority 36 · 4 tellers (not counted) · 2 both
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 302 of the 304 Aye voters and 266 of the 268 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.