Sadly, as I described earlier, if they receive a majority 'Yes' vote from a minority of returned ballot papers then that constitutes a 'Yes' for IA.
Then all members of the Union 'should' take part in IA.
As has been previously stated either vote 'No' if you wish to vote or resign from the Union.
Unite 100%!...........errr............no............perhaps....... . Unite 34%......maybe?