Dealing with a Director Penalty Notice? You have exactly 21 days from the issue...
https://www.generate-bookmark.win/when-a-director-penalty-notice-lands-the-21-day-clock-starts-from-the-issue
Dealing with a Director Penalty Notice? You have exactly 21 days from the issue date to act. Identifying whether it’s a lockdown or non-lockdown DPN is critical for your client’s strategy