The seasonally adjusted index fell to 60.4 from 63.0 in November. A reading above 50 indicates an increase in the pace of activity.

The unadjusted index fell to 49.3 from 62.4.

The gauge of employment rose to an adjusted 56.7 from 53.9, while inventories fell to 49.1 from 60.1.

(Reporting by Alastair Sharp; Editing by Alistair Bell)