Foreign Secretary Jack Straw will visit Auschwitz for the 60th anniversary of the former Nazi concentration camp's liberation, it has been announced.
Altogether, some six million Jews were killed in the Holocaust
Prince Edward will also join the UK delegation in Poland for National Holocaust Memorial Day on 27 January.
Between 1.1 and 1.5 million people, mainly Jews, were killed at Auschwitz.
The Tories said they were glad Mr Straw had been "shamed" into going, having earlier criticised the decision to send a lower-ranking official.
Shadow Foreign Secretary Michael Ancram said: "I am glad the foreign secretary has finally been shamed into representing Britain at this important act of commemoration.
"Once again this government has shown crass insensitivity until it has been forced by public opinion into doing what it should have done in the first place."
The Nazis' final assault on the Jews from 1933-1945
Estimated 15m civilians killed by regime
6m Jews murdered
1942: Gas chambers built at Birkenau concentration camp, mass transports begin
Majority who arrive gassed immediately
About 900,000 gassed at Birkenau
Over 1.1m died at Auschwitz-Birkenau and its sub-camps
1m of them were Jewish
In Britain, the Queen and Prince Philip will lead the nation's commemoration at a service in Westminster Hall, London.
The Queen will also host a reception for holocaust survivors at St James's Palace.
Altogether, some six million people, mainly Jews, perished in the Holocaust.
The Queen's grandson, Prince Harry, sparked outrage earlier this week after photographs of him wearing a Nazi uniform at a costume party emerged.
The prince, 20, apologised, but critics have called for him to go to Auschwitz for the commemoration of the Soviets' 1945 liberation of the camp.
Prince Harry should see for himself "the results of the hated symbol he so foolishly and brazenly chose to wear", Rabbi Marvin Hier, founder of Jewish human rights group the Simon Wiesenthal Center said.