Source: Commons divisions
UK Parliament · Commons Division 256 · 27 April 2016
312 Aye / 260 No · majority 52 · 4 tellers (not counted) · 1 both
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 310 of the 312 Aye voters and 259 of the 260 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.