She said: "I have been made aware that the recently created debenture, on behalf of AIAC on 26 May 2010, is actually invalid as the money was lent two years ago.

"It is my interpretation that AIAC ranks as an unsecured creditor."

David Rubin & Partners senior manager David Stephenson told PrintWeek: "One of the duties of administrators following its appointment is to check the validity of all debentures registered against BemroseBooth.

"The administrators will do this with the assistance of their legal advisors. This check would, of course, include the AIAC debenture."

He confirmed that administrators have not yet been appointed to the company.

Unite regional officer Kathy Brooks said in a statement on Monday (21 June) that she had been informed by Jean-Paul Ansel, chief executive of BemroseBooth, that "because Marks & Spencer (M&S) have decided to stop dealing with the company and because of major problems… related to promotional products with Carboni [sic], we have no choice but to close these two activities".

Retail giant M&S has refuted suggestions that it was in any way responsible for the closure of BemroseBooth's Derby sites.

BenroseBooth filed a notice of intent to appoint an administrator at the High Court of Justice on 16 June.

It has since closed both of its Derby sites, making 140 staff redundant, as well as 26 from its existing Hull plant.