There are two possibilities. The second was simply to move the polling time one hour later, which would allow for Sunday morning worship and activities to be concluded in a church building and for the building to be open by one o'clock rather than noon.
The other option is to sever the requirement that the advance poll be in the same location as the regular poll. As in many cases now, the advance polls are not in the same location as the regular polling station on election day, and that would normally, then, free up church buildings to be available for the regular election day process without having to also be available on the Sunday for the advance polls.