What went wrong? – Carillion was a UK construction company which has been labelled the largest ever trading liquidation in the UK, it had over 43,000 employees and was a massive company but in 2018 entered insolvency (bankruptcy). It’s collapse has became a real drive for audit reform and a lot of people advocating of the big 4 accountancy firms to be separated. It’s cost the UK hundred of millions in taxpayer money.