Bit too late. The CEO who appears mainly responsible for this was removed in July. Having read a bit more about this it appears that a lot of the issues derive from Carillion's valuation of the work on its books. In mid-2017 it wrote down the value by around £850m with a lot of the problems being on the non-UK side of the business in the Middle-east. This followed a "review" by the new Finance Director. Though as the new Finance Director was promoted from his role as Carillion's Financial Controller then you might have expected a bit more insight before this bombshell hit. The company would have been paying dividends and raising capital on the back of the original valuation so when that folded they have been in fire-fighting mode ever since with an interim and then another new Chief Executive appointed in November.
The old CEO probably cashed in his shares, he had 250k of them, at a far higher value than they are today and would have benefitted from the dividends paid on the overvalued company at the end of its 2016 financial year.