Getting a Director Penalty Notice is stressful, but acting fast changes...

https://mighty-wiki.win/index.php/Does_a_Non-Lockdown_DPN_Always_Give_You_21_Days%3F_The_Truth_About_the_%22Clock%22

Getting a Director Penalty Notice is stressful, but acting fast changes everything. That 21-day clock starts from the issue date, not when you open the letter