On one side of the window there are the remains of a picture drawn on plaster.
Christianity, however, was brought to Wales before it came to England.
After consulting council records, Devon and Cornwall Constabulary has written to 780 holiday and second-home owners in the area.
The letters warn the owners that they face prosecution if they fail to ensure that their children and guests abide by the law over the busy summer season.
"It is not our intention to spoil or ruin any person's holiday to Polzeath - but what we ask is that these people conduct themselves with a degree of responsibility," says the letter from Sergeant Robin Moorcroft, of nearby Wadebridge police station."Adults and parents must take responsibility for their children and charges.
They are not to be left to their own devices, unsupervised and allowed to run riot."He says that rented properties can end up being occupied by 20 young people, sometimes with tents in the gardens."As the owner of the house, you are responsible for their actions and behaviour, if you allow this to happen."The letter warns: "Positive action will be taken against any persons committing any offences and action will also be taken against parents/adults who do not supervise their children and young persons under their control adequately."Dr Martin Brooke, a community paediatrician with two teenage children, who lives in Rock and owns two holiday homes in the village, was annoyed to receive the letter.