Maintain the Triple Lock until 2020: Completed (Maintaining)
This is a guarantee to increase the state pension every year by whichever is highest out of inflation, average earnings or a minimum of 2.5%.

There 'will be no change to the Pensions Triple Lock' under the terms of the Conservative/DUP agreement, indicating that it will be maintained until 2020.

Category: Social and Welfare
Source: Manifesto - Page 64
Reference 1: Conservative/DUP Agreement