Hi Keith Davis,
The new State Pension was introduced on 6 April 2016 and the number of qualifying years rose from 30 to 35. The other main difference is that the contracted out D rate of National Insurance Contributions (NICs) was also abolished and were no longer treated as like for like as A rate deducted NICs.
This may be the reason to why more qualifying years are required. You may wish to contact the DWP for a pension forecast, you can do this here:
Check your State Pension forecast
Thank you.