Administrators sifting through the rubble of the ISG collapse have already identified £180m in unpaid bills for the failed contractor’s supply chain.

Updates posted at Companies House cover all of the group’s defunct businesses apart from the fit-out division.

An initial statement of affairs for the main construction division, signed-off by CEO Zoe Price, shows current claims of £89.8m from trade creditors.

The list of hundreds of firms includes 13 subcontractors owed more than £1m each.

At ISG Engineering Services trade creditors are owed £60m while the figure is £28m at ISG Retail.

Industry experts said the bill for the supply chain is expected to rise considerably as more claims are lodged in the coming months.