As an employee of BNP Paribas, you were contractually enrolled into the BNP Paribas Pension (regardless of your age or salary) as soon as you started working for the Bank.
As a member of the Plan, you have your own pension savings account, where any contributions made by you and BNP Paribas will be invested.
For details of the contributions paid by you and the Bank, please refer to your 'Contributions explained' document. This document can be found in the Plan Information section of your PlanViewer account ('Plan Forms and documents') which you can access through Spectrum.
As a UK resident, you may be eligible to receive tax relief from the government too. The BNP Paribas Pension is a 'salary sacrifice' arrangement, which means that you agree to 'sacrifice' a percentage of your earnings (and take a reduced salary) while the Bank increases its contribution to the pension scheme by the same amount that you have sacrificed. In this case, there is no tax relief to claim because you’ve already been taxed on a lower salary amount.
You don’t have to do anything to remain a member of the Plan, but if you decide not to stay in the Plan, you can choose to opt out when you’re first enrolled or you can stop contributing later on.