Papers consider Prince's letters

After Prince Charles' appeals for privacy, the Mail on Sunday publishes his "private letter" to the PM at the height of the foot-and-mouth crisis.

The letter, arguing for vaccination rather than culling, reveals the extent to which the Prince enters sensitive policy areas, the Mail says.

In the Sunday Times, Simon Jenkins urges the Prince to use his status to speak out "even more vigorously".

The Sunday Telegraph says he will stop writing such letters "when he is King".

'Never safe'

The ordeal of the family held hostage by armed robbers in Kent captures the imagination of the Sunday Express.

Its front page says they will "never be safe" after the gang got away with £50m from a depot in Tonbridge.

The paper says they are too scared to go home, while the Sunday Mirror says they will spend the rest of their lives looking over their shoulders.

The Mirror and the News of the World both identify a man they claim is the prime suspect in the robbery.

Confidential reports

The front page of the Observer warns of "dramatic new evidence" that thousands of airline passengers every year could be exposed to toxic gases.

It says that confidential reports by pilots show that, in 40 incidents, they felt dizzy or nauseous after breathing in the fumes.

In many cases the fumes are a result of burning engine oil leaking into the ventilation system, it says.

The government has said it will examine the findings, the paper adds.

'Adolescent giggles'

It seems that some of the great cave paintings of history may simply have been teenagers' sexual doodles.

The Independent on Sunday says an American expert has examined 3,000 images and decided they are comparable to crude graffiti in modern toilets.

The University of Alaska's Professor Dale Guthrie suggests that "adolescent giggles echoed in dark cave passages" where we thought we had found high art.

"Why did they do it?" he asks. "Well, it was fun."