Having checked for my own SP, it looks like the lump sum option is not available for those reaching SP age after 6 April 2016, but deferral is:
https://www.gov.uk/deferring-state-pension/what-you-get
If you reach State Pension age on or after 6 April 2016
Your State Pension will increase every week you defer, as long as you defer for at least 9 weeks.
Your State Pension increases by the equivalent of 1% for every 9 weeks you defer. This works out as just under 5.8% for every full year.
The extra amount is paid with your regular State Pension payment.
Example:
You get £164.35 a week (the full new State Pension). This works out as £8,546.20 a year.
By deferring for one year, you’ll get an extra £493 a year (just under 5.8% of £8,546.20).
This example assumes there is no annual increase in the State Pension. If there is an annual increase, the amount you could get could be larger.
If you reached State Pension age before 6 April 2016
You can usually take your extra State Pension as either:
higher weekly payments
a one-off lump sum
When you claim your deferred State Pension, you’ll get a letter asking how you want to take your extra pension. You’ll have 3 months from receiving that letter to decide.
Higher weekly payments
Your State Pension will increase every week you defer, as long as you defer for at least 5 weeks.
Your State Pension increases by the equivalent of 1% for every 5 weeks you defer. This works out as 10.4% for every full year.
The extra amount is paid with your regular State Pension payment.