Jam and Jerusalem

Comedy drama series. The Ladies Guild is helping to dress the church ready for Harvest Festival, much to the despair of the grumpy vicar, who complains about the display being just tins and packets. So Rosie goes to the allotment to find some 'fresh' for the display. She discovers instead a potato with Jesus's face on it. The vicar doesn't agree that the potato could be a calling from God, as why would God call someone like Rosie?