Dealing with a Director Penalty Notice? You have exactly 21 days from the issue...

https://wiki-byte.win/index.php/How_to_Explain_Lockdown_vs_Non-Lockdown_DPNs_to_a_Panicking_Director

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