Robbie Williams and All Saints members Natalie and Nicole Appleton and Melanie Blatt took part in a 15-minute stretch of the two-and-a-half hour People's Procession through London.

More than 200 people filed past the Chinese and US embassies and the Russian Federation Consulate, calling on the three countries to sign the Ottawa Treaty outlawing the manufacture, sale and use of all anti-personnel mines.

The demonstration went to the Canadian High Commission to congratulate staff inside for the international treaty.

Natalie Appleton held hands with boyfriend and children's TV presenter Jamie Theakston and her six-year-old daughter Rachel as they emerged from the commision.

She said: "It is a great cause and I hope people will be more aware of what is going on. The fact that I have a child makes me feel this is a very important issue because so many children are being hurt."

Pregnant Melanie Blatt said: "This is an issue which should be well documented especially because it affects so many children who are just so defenceless. "The fact that I am pregnant makes me feel this even more strongly."

Terry Waite: "Many victims are innocent children"

The UK signed the Ottawa Treaty, which prohibited the use, production, sale, stockpiling and transfer of landmines, in the wake of the death of Diana, Princess of Wales.

The march took place weeks before the first anniversary of the princess's death on 31 August.

Former hostage and special envoy to the Archbishop of Canterbury, Terry Waite, is another sponsor of the march.

He said: "All too frequently the victims of landmines are children and innocent civilians.

"When the victim is not killed outright, they are frequently maimed for life. An immediate ban is urgently required. We must do what we can to rid the world of this terrible scourge."

Diana mine armour to go on display

Princess Diana: The body armour she wore on this trip will be put on display

The protective suit the Princess of Wales when she walked near a minefield in Angola to publicise the destruction landmines cause is go on display this week

Landmines: The Human Cost opens on Thursday at the Royal Armouries Museum in Leeds, run by the United Nations and the Imperial War Museum.