Further to my post (no pun intended) above.
Contact was made with unite about 10 days ago upon receipt of a letter checking that the ballot (only 1 "t" in ballot) paper had been received. Due to living outside the UK, postage takes a little longer than it would to either Crawley or Glasgow. I imagine the missing ballot is due to the lack of international postage applied to the envelope as is the case with every other piece correspondence received from Unite.
Need I say more?