Results of a side-by-side comparison of wind speed, as measured by three Met Office observing systems, are presented. Mean wind speeds as measured by each system differed by < 1.0 knots (0.5 m s−1) at wind speeds of up to 30 knots (15.4 m s−1). Although differences increased slightly with increasing wind speed, they remained within user-specified accuracy limits over the whole range of wind speeds experienced. The trial set-up involved the mounting of anemometers on a single mast. Although a slight sheltering of anemometers occurred at given wind directions, the effect on the overall wind speed differences was negligible. © 2012 British Crown copyright, the Met Office. Published by John Wiley & Sons Ltd.