Got this today from HMR&C
We are writing to you because there is a gap in your National Insurance contributions (NICs) for the tax year 2006-07 and to tell you how you can make up the gap if you want to. Some of the reasons why you might have this gap are explained on the next page.
What is my current situation?
So far you have 39 years which count towards your basic State Pension. You need 30 years which count to get a full basic State Pension. If you want to you can pay £392.60 to make 2006-07 count as well. But you don't have to pay.
The last sentence says it all but why waste the effort on a mail shot. Is HMG that short of money?