Phoenix Venture Holdings has promised to file accounts covering the last full year of MG Rover in the "next few days".
Companies House is losing patience with PVH, which has delayed 2004 accounts for four months. In October PVH had an extension until January 31 to file the report covering the Longbridge carmaker's financial performance for 2004. But the accounts have still not been filed amid delays by auditors Deloitte and PVH.
The year is vital because it details frantic negotiations with prospective joint venture partner Shanghai Automotive and plummeting sales which triggered its demise in April.
If PVH fails to send the accounts again, the directors, including chairman John Towers, could face legal action, fines of up to £5,000 and a criminal record.
A spokesman for Companies House said: "They have been in correspondence with us, and now it is a question of waiting for the accounts to arrive. It is imperative they send these accounts as soon as possible. If they do not in the next few weeks we will have to explore what further action can be taken."