This part of GOV.UK is being rebuilt – find out what beta means

HMRC internal manual

Excise Assessments Interim Guidance

Notifying assessments - forms, letters and schedules: Form EX602 - Amendments to officers assessments or civil penalties

Form EX 602 is used to reduce or withdraw an excise assessment or civil penalty notified on Form EX 601, see EAIG25200.