Receiving a Director Penalty Notice puts your client on a strict 21-day clock...

https://foxtrot-wiki.win/index.php/The_Solicitor%E2%80%99s_Guide:_What_Needs_to_be_in_a_DPN_Evidence_Pack

Receiving a Director Penalty Notice puts your client on a strict 21-day clock starting from the issue date. The consequences depend heavily on whether it’s a lockdown or non-lockdown notice