Ann: Notice of Annual General Meeting/Proxy Form, page-183

Here's some charts; I believe they use data from December 2017 but nothings changed, in fact according to the companies last press release (re sales) it's getting worse.

The problem with such high debt (it's not small btw) is they typically wont get any more so then cash flow becomes the only lifeblood (apart from a cr which considering everything I would rate as remote) So I've included an historical cash flow chart. They are well past the first mover to market stage so competitors now close in hence the diminished sales they call " margin pressure ".
The total debt/total equity ratio speaks for itself and would stop any lender in their tracks.

The two canaries in the coalmine to chapter 11 are cash flow and debt/equity. In some cases winning a large contract makes it worse.