If I retire later this year (when I will be 66) will my retirement pension be based on classic (final salary) scheme or the alpha Career Average (CARE) scheme?

Your benefits until 31 March 2022 will be calculated as classic (final salary) but will be based on your pensionable earnings/final salary at the date you actually retire. Your benefits from 1 April 2022 will be calculated as alpha (CARE).