You could think about joining the 50/50 section where you pay half contributions for half your normal pension. Regardless of the section you're in, you get full life assurance cover and ill health benefits.
This will depend on the reason for the reduction:
If I'm on sick leave?
If I'm granted a period of authorised unpaid leave?
If you're on maternity, adoption, or paternity leave, or shared parental leave
During child related leave your pension is worked out using your assumed pensionable pay (where this is higher than the amount of pensionable pay you actually receive to make sure your pension is not affected by the reduction in pay. If you're in the 50/50 section and go onto no pay during ordinary maternity & adoption leave (usually the first 26 weeks) or paternity leave you will be moved to the main section at the next pay period. Any period of unpaid additional maternity or adoption leave (normally from weeks 39-52) or unpaid shared parental leave will not count for pension purposes unless you elect to pay Additional Pension Contributions (APCs) to purchase the amount of pension lost during that period of unpaid absence.