Prepare a written, dated, signed resignation letter that indicates the effective date of your resignation. To resign as a director at Companies House you can use the TM01 form.The quickest way is to use the online service to update your information. 1. Prepare for board resignations in advance. King Resignation Free download as PDF File (. Pdf) or read online for free. You can think of following: 1. Send a letter to your previous company regretting your inability to serve the notice period. This checklist covers the steps to take when a director of a Canadian federal corporation is resigning. A director should submit a written resignation letter that notes the effective date of their departure.