Celebrity Surgery: Who's Had What Done? (ITV1): Horizon: The Lost Civilisation of Peru (BBC2): MANY years ago - and the more mature among you will surely remember - people used to wonder which twin had the Toni.

Nowadays the speculation is not about permanent waves but breasts and other body parts.

TV joins the debate in Celebrity Surgery, which panders to the inquisitive side of us all concerning the looks of those who are richer and more famous. Newsagents' shelves are packed with magazines devoted to such things.

The opener in the series managed to make a mountain out of a molehill, so to speak, by trying to guess whether Victoria Beckham has had boob jobs and exactly how many Pamela Anderson has undergone.

A few years ago, spending a 30-minute programme discussing such matters would have been unthinkable. Now it passes for mainstream TV.

The format is simple: Alex Karidis, surgeon to the stars, gets a pen and draws circles on photographs of Posh and Pam, highlighting the evidence of breast surgery.

He's careful to add the phrase "in my opinion" at every opportunity to stop the pair rushing to phone their lawyers. Posh has always denied having a boob job, but clever Mr Karidis reckons she's had three, including one to reduce them.

Baywatch star Anderson is more upfront about her breasts. She even bought two of her best friends boob jobs for Christmas. Karidis says - in his opinion, remember - that she's had four boob jobs. Not very good ones, presumably, as he noted that they looked artificial.

A note of caution was introduced with the case of the late Lola Ferrari, a favourite on Eurotrash. She was addicted to plastic surgery, having 18 operations on her breasts to make them 54G. Each one weighed six pounds "which must have crippled her" according to the good doctor.

Funnily enough, Horizon was about "strange shaped mounds" too. These are the legacy of the Moche, a little-known civilisation 2,000 years ago in a remote desert area of Peru sandwiched between the Andes mountains and the Pacific Ocean.

The Moche built huge pyramids in the desert and enjoyed a culture of extravagant wealth and extreme violence. Then, almost overnight it seemed, they vanished from the face of the earth. Horizon tried to discover what happened.

The documentary spent most of the 50 minutes building up a theory involving ritual human sacrifice and an environmental catastrophe, only to shoot it down in the last ten minutes.

The conclusion was that the Moche people survived the elements - a climate of great drought and heavy rainfall - only to kill each other.

The cycle of flooding and drought put great stress on the economy, which collapsed and led to them fighting among themselves. The weather didn't kill them, civil war did.

Published: 04/03/2005