[spoiler]
I think they were running to avoid Vicky beong caught alive and re-executed for witchcraft.
Really? Then perhaps that coffin in the study (that's where it was right? And why didn't they use that study more often?) would have served as a handy carrying case for reanimated, secretly on-the-lam Victoria, to allay suspicion. Maybe PB could get a nice horse-drawn hearse. If stopped, Bradford could have been taken for a nutjob who likes to take his dead girlfriend on trips to the country, though that's probably illegal too. It sounds like believable behavior for any Roger Davis character, however.
I want Vicki to look in a mirror, and get fatally confused over the fact that even though everyone there looks like people from 1967/8, SHE no longer looks like her 1968 self.... (either of them) She could have exited the stage saying, "I.... don't.... UNDER--" (collapses)[/spoiler]