"Perhaps it is also worried about the Australian firm's lack of experience in the UK market and the labyrinthine NHS specifically."
If iSoft failed to find a workable takeover and faced "final collapse" when its agreed banking facilities ran out in November, CSC "could always step in and take over the development of the NPfIT applications itself (without formally acquiring iSoft as a whole, something it is unlikely to want to do)", Codling said.
"CSC already has around 100 staff working with the iSoft development team, and may conclude that exercising this option of direct control is the best way of finally getting Lorenzo finished and working at the NHS.
"Alternatively, the door may now be open to other parties (including McKesson and General Atlantic) that were previously interested in acquiring iSoft."
NHS Connecting for Health, which runs NPfIT, said the matter was one for CSC. A spokesperson added: "NHS Connecting for Health has bought services from prime suppliers whose responsibility it is to choose their technology solution. We have had no approach from CSC in connection with this matter.
"If a supplier wishes to change the contract, they will need to negotiate and agree that change with us. When this has happened previously - as with BT and Fujitsu changing their subcontractor - we have protected the taxpayer by maintaining the original terms and conditions of the contract."