Whilst agreeing with the above [and thanks from me to AV Flyer as well] I wonder whether errors made in balloting are of sufficient magnitude to "materially affect the outcome"?
Whilst personally having no truck with Unite/BASSA, I had a twinge of sympathy [which quickly passed] when McLuskey commented somewhere about BA's nit-picking. Whilst 100% accuracy on a postal ballot may realistically be unachievable, what degree of accuracy is actually acceptable/unacceptable in these cases?
If, of course, BA has been made aware of dozens/hundreds of misdirected ballots there may be a case for Unite/BASSA to answer.