K Roscoe

Hi, my limited company client is intending to cease trading and enter into a MVL arrangement. The normal year end is 31/03 and a CT600 has been filed for 31/03/24. The last day of trading was 03/12/24 and accounts have been prepared up to this date. Can someone please advise whether I can just file a CT600 for 01/04/24-03/12/24 or do I have to contact HMRC to officially get the date recognised before I file it. Many thanks for any help.