Thames Water Plc hasn’t published a crucial business plan outlining information about the company’s financial stability, a move that’s prompting concern among bondholders.

The water company, which provides services to around 15 million people in London, has so far only submitted a 13-page summary which lacks details needed for a full assessment, analysts say. Thames Water has been under intense scrutiny after it’s debt costs increased, which led the UK government to draw up contingency plans which at one point included a temporary nationalization, Bloomberg reported in June.