ESSUM56200 - Option notifications: Correction of notice by HMRC
HMRC can correct obvious errors or omissions in a notification within nine months of a notification being given. The Small Company Enterprise Centre (SCEC) will inform the employer of any changes made. The employer then has three months from the date of issue to reject the corrections. (Paragraph 45)
The employer should let the SCEC know if a mistake has been made in notifying the grant of the option.