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This depends on the reason you are retiring and claiming your benefits.
 
If you are claiming your benefits on the grounds of ill health then you will only be able to commute some pension from both Schemes together or not at all. You would not be able to commute pension from one Scheme and not the other.

If you are claiming your benefits for any other reason you would have the option to commute some of your pension from each Section / Scheme independently.