David Cameron called for the next wave of international development targets to focus on extreme poverty.
The Prime Minister, in Liberia to attend a UN meeting, also insisted bolstering security and civil structures was crucial, alongside aid measures.
More top news
Kate will join Prince William on a tour of the Stephen Lawrence Centre before visiting a charity working with disadvantaged young people.
There is an "urgent need" for a "simpler and more trusted" system for investigating clinical failures, according to a damning report.
Over 100 mothers and fathers were investigated for leaving their children unsupervised in the final three months of 2014, new figures find.