You should get a letter four months before you reach the State Pension age, telling you how to claim your pension. If you don't get a letter, you can claim online or over the phone.
The State Pension is changing to a single tier rate
, if you are due to reach State Pension Age after 6 April 2016.
For those retiring on or before 5 April 2016, there are usually two parts to your State Pension - basic and additional. In 2015, the most an individual can get on the basic State Pension is £115.95 a week. Your additional State Pension depends on the National Insurance contributions you made while you were earning.
For most people the State Pension is not a lot to live on, and may be subject to change under future governments. Its best to make your own pension provision, rather than rely solely on the State Pension.