Source: Commons divisions
UK Parliament · Commons Division 249 · 25 April 2016
302 Aye / 266 No · majority 36 · 4 tellers (not counted) · 1 both
Totals are Parliament’s official count, which does not include the tellers. Parliament’s published list names 301 of the 302 Aye voters and 265 of the 266 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.