Barry Stewart and George Lafferty from Leonard Curtis, who have been managing the administration process, said the move aims to maximise the return to creditors who are collectively owed millions of pounds.

After conducting a “bank statement analysis”, the administrators determined that McGill is owed the significant sum by United Capital Investments, which is controlled by Scottish businessman Graeme Carling and his wife Leanne.

The latest progress report filed by the administrators with Companies House stated: “The joint administrators wrote to UC on a number of occasions seeking proposals for repayment of the balance outstanding of £442,602.

“No proposals for repayment were received, nor any evidence from UC that the sums we were pursuing were not due, despite requests. We then instructed TLT Solicitors to formally take steps to recover the balance outstanding.

“TLT then carried out their own reconciliation of the balance outstanding based on our evidence and wrote to UC seeking repayment of the outstanding sums. No response was received in the required timescale.

“TLT have subsequently prepared a summons which has been served on UC.”

A statement from UC’s former financial officer Kevan Sturrock in response to the claim emphasised that UC remains the largest creditor, with losses estimated at around £2.2 million following McGill’s collapse.

Mr Sturrock told The Courier: “I am surprised and disappointed with the lack of progress that appears to have been made by the administrators in the last six months and the continued investigation into already satisfied questions.

“I have personally attended numerous in-person meetings, video calls, and have provided substantial amounts of information whenever asked. It is bitterly disappointing to read comments that we have not been communicating with the administrators.

“Neither I, nor any representatives of UC have received any communications from the administrators over the past six months, so the comment that we haven’t responded is not a reflection of reality.

“I remain resolute that United Capital Investments holds the position as the largest creditor to McGill Facilities Management.”

Earlier this year, it emerged that Leonard Curtis is investigating the transfer of money and contracts to a “connected” business as part of a wider scrutiny of McGill’s financial dealings.

The administrator is also to examine why 20 McGill employees were never enrolled into the company’s pension scheme despite contributions being taken from their wages.

Once McGill’s notice of intent to appoint administrators became public, reports surfaced that some employees had not received their wages. Employees then contacted Scottish Construction Now to raise concerns over their pensions - alleging that pension contributions deducted from some employees’ wages have not been paid into the designated pension fund and claiming that the pension scheme has not been registered with HMRC.