Writing in The Big Issue (p21) Mr Blair says one of the things he was struck with when Labour came to power was the lack of co-ordination in tackling certain problems like rough sleeping.
He says he wants all the relevant organisations, including local authorities, to work in new ways, co-ordinating better what the government does to help the most vulnerable in society.
He writes: 'Life on the streets can be the legacy of institutional life - in local authority care, prison or the armed forces. The sad fact is that one in three rough sleepers has been in local authority care. They lack the family support the rest of us can take for granted when we leave home.'