Well, in case there's someone else with Bookmaker in this situation.. Their House Rules didn't sound encouraging. Something like "all future wagers are treated as "all in" or "entered not entered". Stakes are lost on a future bet if a selection does not take part..."
BOOO! Spoke with Live Chat. They were arguing that he did tee off. I stopped arguing and asked, once it was determined he didn't tee off would the bet be cancelled. They agreed that it was "pending" and if it changes all bets will be "updated." I tried again to confirm if "updated" meant "cancelled" and they could not confirm that. Not feeling optimistic. Again, not a large wager but very annoying.