More than 1,000 staff employed on hospital facilities maintenance contract have been transferred over to new employers in the past week.

This means that around three-quarters of the pre-liquidation workforce of 18,000 have now been found secure ongoing employment.

Around 2,400 or 13% have been made redundant, while 1,256 employees have left the business during the liquidation through finding new work, retirement or for other reasons.

The Official Receiver said the rump of staff left would be retained to enable Carillion to deliver the remaining services it is providing for public and private sector customers until decisions are taken to transfer or cease its remaining contracts.

Official Receiver David Chapman has also revealed the scale of the task facing his team and PWC advisers sifting through Carillion’s records as part of their investigation into the firm’s collapse.

Writing to the chairs of the joint business and work and pensions committee he said PWC was needed to help his investigation team wade through the mountain of company records.

Carillion operated more than 300 IT systems spread across data centres, physical sites and ‘cloud’ providers.

The total data held in these systems is around 350 terabytes and the company’s internal financial reporting system holds over 6 billion rows of data.