Little also read out comments from a mental health nurse about the extra hours people in the profession were working to cope with under-staffing, and from a person who said they couldn't get treatment unless they were on "the verge of suicide".
English said ensuring people got the support they needed was a priority for the Government, "but there is always more to do".
The number of people needing secondary mental health and addiction services had increased substantially, the Prime Minister said.
"There is more funding for acute services and for prevention to try and prevent people getting into the situation where they need acute services."
Earlier, Health Minister Dr Jonathan Coleman said the people behind Action Station were "very left-wing, anti-Government protesters".
English last week announced this month's Budget will include a $321m social investment spending package. And Coleman has confirmed the May 25 Budget will include new funding for mental health and addiction services as part of the social investment package.
However, he stressed most work will operate within existing baselines.
Little this month told a meeting in Rotorua that addressing mental health services would be a priority for Labour.
"Everywhere I go people tell me stories of someone who's been let down by mental health services which are stretched to breaking point."