Twenty-eight female guards were unfairly dismissed by a security company because the client‚ Metrora.
Two children from Musina in Limpopo represented South Africa at the Global Children's Panel in London.
Dominic Nkwana, 15, a Grade 8 pupil at Musina High School and Polite Singo , 12, who is doing Grade 6 at Makushu Primary School, left South Africa on Saturday.
The initiative is the brainchild of an organisation called Save The Children UK, whose offices are based in London.
The organisation fights for the rights of children and it has offices worldwide.
Fifteen children from various countries, including China, England, Mongolia, Liberia, Brazil and Bangladesh, share ideas about their experiences in their home countries.
The Global Children's Panel is like a "parliament" where children are encouraged to participate in the decision-making on issues that affect them directly.
The official programme started on Monday and ends today.
The duo from South Africa will rest for a day after the function and will take a return flight home on Sunday.
They are expected back in South Africa on Monday.
The two children were accompanied by David Mokobi, the personal assistant to the mayor of Musina, Caroline Mahasela.
All special projects concerning children are handled by the mayor's office.
Before he left Dominic said he was very happy to represent his country in London.
"This is a dream come because I never thought that I would represent my country abroad.
Musina spokesman Wilson Dzebu explained how the children were selected:
"We have committees and councils in different wards of the municipality. The two were chosen through a selection process with strict criteria.
"We are very proud to have represented South Africa."