The ballot papers for the HTD 'buy out' will be issued after the conclusion of the pay ballot, if it is a 'yes' vote.
If the pay ballot is a 'no' and they have to renegotiate pay then the HTD ballot will be delayed until after that vote.
To find out how much you will be 'paid' before tax under the proposed buy out. Look at your November pay slip multiply your HTD by 24 and add £250 et voila your pre tax offer