Also it has emerged that Keltbray paid £8.5m for Dunne’s Bathgate head office and plant in a deal concluded four weeks after the firm collapsed laying off 574 staff.

Insolvency specialist FRP Advisory detailed the level of debt across all six businesses placed in administration in a report to creditors.

At the two key businesses – Dunne Building and Civil Engineering and CLR Plant Hire – trade creditors and suppliers are nearly £15m out of pocket.

Dunne Building and Civil Engineering owes a further £13.8m to associated group companies.

Property and plant held by the two companies and parent group were secured from administrators by Keltbray nearly four weeks later.

This deal prompted the demolition contractor to set up a concrete frame business with Gordon Dunne taking a 20% stake and the role of managing director.

The administrator’s report reveals that turnover at the main concrete frame business rocketed in the last four years from £37m in 2013 to £94m forecasted for this year.

But the firm ran into cash flow problems after taking a £4.5m hit in 2015 on two loss-making contracts .

Cash flow pressure came to a head early in 2016. Dunne’s biggest main contractor client Multiplex was then persuaded to release £5m in accelerated payments to keep the firm going on its jobs.

But postponement of ongoing work of one of Dunne’s Multiplex contracts tipped the firm into a crisis in June, forcing the director to seek significant extra facilities with Dunne’s bank Santander.

But talks ended in deadlock forcing the directors to request the bank call in administrators on 19 July.

FRP Advisory has estimated the amount due to creditors and have requested detail information from Dunne’s directors to compile a more accurate evaluation of sums due. Several subcontractors contacting the Enquirer claim they are owed significantly more than has been initially estimated.