Source: Commons divisions
UK Parliament · Commons Division 257 · 27 April 2016
307 Aye / 268 No · majority 39 · 4 tellers (not counted) · 1 both
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 306 of the 307 Aye voters and 267 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.