Sally wonders if she may be pregnant, but the doctor quickly reports a negative test. Of course, that's not stopping Peter, Simon, Jane, Auntie, and eventually even David from getting the wrong end of the stick - not to mention the rest of the town!

After Peter and Jane get into a spot of trouble at school, Sally and David invite the two respective teachers for a barbecue to smooth things over, but neither are aware that the pair are romantically involved with each other!