A PRIVATE sector operator whose bid to take over ferry services in the western isles was rejected has revealed it never expected to win the contract.

In a notice to the stock exchange yesterday, Serco, which currently operates the Northlink Ferries service to Orkney and Shetland and the Caledonian Sleeper franchise, indicated that it had never had high hopes of winning the CalMac contract and revealed that Transport Scotland had deemed its bid "non-compliant" - meaning that it had failed to meet some of the minimum criteria set out in the tender.

In a statement, it said: "Serco’s bid sought certain changes to commercial terms aimed at striking a balance between the risks and rewards involved, but in so doing the bid was deemed non-compliant by Transport Scotland ... there is no significant impact to our previously stated guidance given the low probability of success we had ascribed to this bid."

One industry source said this hinted at a bidding process skewed in favour of the public sector candidate, adding: "CalMac didn't win. They just haven't lost."

A spokesman for Serco declined to comment.

It came as the Scottish Government announced plans to award the next eight-year contract to run the Clyde and Hebrides Ferry Services network to the existing state-owned operator, Caledonian MacBrayne.

The new contract will begin on October 1 this year.

Ministers had faced criticism for opening the contest to private bidders - a move they insisted was required under EU rules - and would have faced a backlash from political opponents and campaigners if the £900 million contract had been awarded to Serco Caledonian Ferries Ltd.

Trade unions welcomed the announcement, which came with assurances that there would be no compulsory redundancies and no change to the CalMac pensions scheme.

Mick Cash, General Secretary of the RMT, said it was a "complete vindication" of a walkout by CalMac members last summer in protest over the potential takeover by Serco. The strike saw two thirds of west coast ferry services cancelled.

Mr Cash added: "This is a major victory for RMT and its successful defence of the principle of public ownership and operation of lifeline Scottish ferry services."

CalMac's contract bid makes almost 350 commitments to improve the service, including investments in vessel and port improvements, increasing traffic, providing more opportunities for local employment, more community engagement, and maintaining all existing routes and services.

First Minister Nicola Sturgeon said CalMac's bid offered a "good deal" for the communities it serves.

She added: "Scottish ministers will retain control of all of important issues, such as fares and timetables, through the public service contract."

Scottish Labour MSP, David Stewart, said the party would now campaign to halt tendering processes for the Gourock to Dunoon and Northern Isles Services ferry contracts.

He said: “It is clear that a tendering process was not necessary, and we have to ask why the SNP Government thought it was necessary to go throw a costly and time consuming process, which put the future of a public CalMac at risk, when it simply didn't need to."

Martin Dorchester, managing director, said: "Our successful bid demonstrates our ability to provide innovative service improvements and value for money for customers."

Kevin Craven, chief executive of Serco's UK central government division, said: "We are obviously disappointed by this decision as we believe that we could have made significant improvements to the quality and reliability of these services to the benefit of the communities across the Western Isles."