furrypusscat...from the following link, that deferment parentage is now 5.8%
https://www.gov.uk/deferring-state-pension/what-you-get
But by deferring your State Pension, you may now miss out on £155:65 per week / £8093:80 per year. On the calculation given in the above link, a gain of £468 per year is obtained by deferment.
But in deferring, you would miss on £8093 per year, which you would only get back by living a very long time ! State Pensions are not like works pensions....there is no "widows pension" after you die.....once you are dead, the State Pension is dead as well.
So.... if you deferred for 5 years, and then died, be fore claiming the pension, all that £8093 per year is lost for ever !