UK Tax Questions? Ask a UK Tax Advisor for answers ASAP
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If you are making good all the private fuel costs, then your employer should not be raising a charge for fuel benefit through the P11d.
Speak with the payroll department to see if they are operating this element correctly, or ask them to contact HMRC to verify this position, so they can make sure you only get charged for the company car element.
(DO note that private mileage also should include travel to and from home)