Have now found the actual report. Its very long.
How DWP communicated changes to State Pension age
We found failings in DWP’s communication about changes to women’s State Pension age.
Communication between 1995 and 2004
Between 1995 and 2004, DWP’s communication of changes to State Pension age reflected the standards we would expect it to meet. Accurate information was publicly available through DWP’s agencies, pension education campaigns, leaflets and website.
Communication from 2005 onwards
Research reported in 2004 showed that information about State Pension age changes was not reaching the people who needed it most. The researchers recommended that information should be ‘appropriately targeted’.
DWP failed to take this feedback into account properly when deciding in August 2005 what to do next. It had identified it could do more but did not.
A survey in 2006 showed that too many women still thought their State Pension age was 60.
In November 2006, DWP proposed writing directly to women to let them know about their State Pension age. But it failed to do anything about that proposal until December 2007.
How DWP communicated National Insurance qualifying years information
We found failings in how DWP communicated information about National Insurance qualifying years.
Due to the 2014 Pensions Act and the introduction of the new State Pension, there were changes to the number of National Insurance qualifying years needed to claim the full rate of State Pension. There was timely and accurate information available about this.
However, research showed too many people did not understand their own situations and how the new State Pension affected them personally. The Work and Pensions Committee and the National Audit Office, as well as research that DWP commissioned, highlighted this gap between awareness and understanding. DWP failed to use this research and feedback to improve its service and performance.
Full report here https://www.ombudsman.org.uk/complaints-womens-state-pension-age