When he spoke at his daughter's funeral last week, Mitch revealed plans to set up the Amy Winehouse Foundation "to help the things she loved - children, horses, but also to help those struggling with substance abuse".
As well as meeting chairman of the Home Affairs Select Committee Keith Vaz, Mitch also spoke with Home Office minister James Brokenshire about the issue, Sky News reports.
Mitch said: "This isn't only important to me, this is important to our whole country. There's hundreds of thousands of young people in situations today that could be avoided.
"These are our future policemen, doctors and lawyers and solicitors, that we could help. We need to be able to help our children."
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He continued: "I spoke to the commons select committee once more about this stuff, and I think there's a new emphasis and new thinking within the government to try and get treatment in at the sharp end.
"Rather than money being wasted through the criminal justice system, there could be a reallocation of funds - we're not even talking about any new money."
Mitch added: "There was one rehab centre for juveniles in Middlegate [in Lincolnshire] and it's just shut down because of lack of funding, so we need to look at that.
"This isn't about Amy - we were in the fortunate position of being able to fund Amy to go into private rehab, this is about people who can't afford it."
Vaz said: "As a result of what he has said to me today I will ask members of the committee to look again at this issue.
"I am also keen, in view of what he has said today, to hear from other people who have also found it difficult to get rehabilitation for whatever reason. The best way to help people is to rehabilitate them."
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