Streatham MP Chuka Umunna, who is also PPS to Labour leader Ed Miliband, heard the testimony of survivor Agnes Grunwald-Spier at the Lambeth HMD event.
Mr Umunna also addressed the audience and there were contributions from youngsters from Lambeth primary and secondary schools and South London Liberal Synagogue. The shul hosted an educational project for 100 pupils of Dunraven School, Streatham.
In Lewisham, faith groups and children from across the borough came together for an event at the Broadway Theatre, Catford.
In front of an audience of nearly 800, the children presented the stories of victims of genocide and persecution through dance, drama and musical pieces. Catford and Bromley Synagogue was among organisations involved.
Lewisham Mayor Sir Steve Bullock said: "Telling stories is a way to remember the past. It is important that we never forget those who have suffered and died but honour their memories by working together to ensure these atrocities never happen again."
At Edgware Masorti, the commemorative event included the screening of a rare Nazi propaganda film, purportedly showing Jews being fairly treated. In fact, all the Jews in the film were Shoah victims. Nathalie Goldman and Lucy Stone gave a poignant account of their recent school visit to Auschwitz.
In Bristol, former Board of Deputies' president Lionel Kopelowitz returned to his old school, Clifton College, to give a sermon on the 70th anniversary of the school's wartime evacuation to Bude in Cornwall.
Before more than 1,000 pupils, parents, teachers and guests, Dr Kopelowitz recalled his experiences as a Clifton student at the outbreak of war. Clifton became the headquarters for the American forces in Europe.
The mayors of Bournemouth and Poole were among 80 people at an HMD commemoration in the hall of the multi-faith chaplaincy at Bournemouth University.
Candles were lit by survivors Walter and Herta Kammerling, local rabbis and the Bournemouth Mosque imam and readings on tolerance and justice were given by representatives of different faiths.
Rabbi David Katanka and warden Tony Cooper of Portsmouth and Southsea Hebrew Congregation led a service at the Holocaust memorial outside the D-Day Museum in Southsea.
Synagogue elders Julius Klein and Alan Berman and treasurer David Clannachan also contributed and guests included Portsmouth Lord Mayor Councillor Paula Riches.
The small Isle of Wight community participated in the HMD service at the Methodist church in Castletown attended by many local dignitaries. The service was organised by Leonard Singer, who recited kaddish. Isle of Man Jewish Community secretary Carol Jempson related an "untold story" about family and friends.