The person concerned reached pension age on 15 July 1999. Their application for State Pension (contributory) was received on 02 March 2012.
At that time, legislation provided for backdating of late State Pension (contributory) and Allowance applications on a proportionate basis based on the length of time from date of receipt of the application to date of entitlement to State Pension (Contributory). As the period in this case exceeded 5 years, the pension was backdated by 125 weeks plus 10% of the period exceeding 5 years in accordance with the terms of the legislation.
I hope this clarifies the position for the Deputy.