Diminishing UK public sector contracts contributed to the mixed year-end results announced today by IT services giant Atos Origin.

The group's overall operating margin of €337m was up to 6.7 per cent of revenue in 2010, compared with 5.7 per cent in 2009. But that was on revenues of €5,021m, a decline of 3.5 per cent on last year.

As part of the year-end results announcement, Atos also laid out its plans for integrating SIS.