JCT: Main contractors OHP percentage for Subcontractor priced variations

Can you please give me the prescribed method for obtaining the main contractors OHP percentage for Subcontractor priced variations in JCT ICD11.
In the Daywork Section of this contract, materials and goods OHP are 30% and plant OHP is 10%.

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I do not believe there is a “prescribed method”. If a percentage is not stated you will need to agree a suitable rate.