Recently checked my Pension Forecast on the .Gov gateway app and discovered that the year 20-21 was only partially paid, (turns out it was because my son was 12 that year), so only 36 weeks paid. It says I can make a Voluntary Contribution to top up the year but it doesn't tell me how, I keep following the links but they seem to just go round in circles. I rang HMRC but they referred me to Future Pensions Centre who referred me back to HMRC as apparently they collect the payment.
Does anyone know how I make the payment.