Anti war activists will hold a "naming the dead" ceremony on Sunday as part of their campaign to bring British troops home from Afghanistan.
MPs will join the event in central London, after which members of military families will deliver a letter to the Prime Minister calling on him to bring the troops home by Christmas. It is signed by 19 members of families who have or have had loved ones in Afghanistan.
The family members will be joined by Labour MP Paul Flynn, who was suspended from parliament over comments he made about the conflict.
He said: "We are fighting an unwinnable war of occupation and the sooner we follow our former coalition partners in withdrawing from the country the better. Unfortunately successive governments have failed to realise this and continue putting the lives of our soldiers at risk, repeating the tired mantra that they are reducing the threat of terrorism in the UK in doing so."
Prince Harry in Afghanistan
Prince Harry sits atop a spartan armoured vehicle in the desert in Helmand Province, Southern Afghanistan.
Prince Harry in Afghanistan
Prince Harry sits with Lance Cpl of Horse Chris 'Dougie' Douglass atop a spartan armoured vehicle in Helmand Province in Southern Afghanistan.
An Afghan driver claps as Afghanistan Ol
An Afghan driver claps as Afghanistan Olympic team arrives in back to Kabul on August 14, 2012 following the completion of the 2012 London Olympic Games. The six-strong Afghanistan Olympic team returned to Kabul, bringing home a bronze medal in taekwondo. AFP PHOTO / Massoud HOSSAINI (Photo credit should read MASSOUD HOSSAINI/AFP/GettyImages)
Britain's Prince Harry (2nd R) walks past an Apache helicopter upon his arrival at Camp Bastion in Afghanistan, on September 7, 2012. Britain's Prince Harry is back in Afghanistan to serve as a military helicopter pilot four years after his previous deployment there had to be cut short, the Ministry of Defence said on Friday. AFP PHOTO / JOHN STILLWELL/POOL (Photo credit should read JOHN STILLWELL/AFP/GettyImages)
This file photo of May 5, 2005 made available by Right Livelihood Thursday Sept. 27, 2012 shows the organization Britain's Campaign Against Arms Trade, CAAT, protesting in London. A British anti-arms trade campaign and promoters of peace, human rights and the environment from the United States, Afghanistan and Turkey have been named as winners of this year's Right Livelihood Awards, also known as the "alternative Nobels." The Campaign Against Arms Trade, or CAAT, was cited for increasing public awareness of the global arms trade. Through its campaigning, the jury said, CAAT has exposed "the corruption, hypocrisy and lethal consequences around this trade and has been instrumental in holding the U.K. government and arms companies to account for the same." (AP Photo/Przemek Wajerowicz, CAAT, Right Livelihood, HO)