UK
Currently (late 2013June 2014) the UK BUFR radiosonde data on the GTS is available as both a) reformatted TEMP reports (separate parts), within the Met Office and b) high-resolution (two-second) BUFR reports are available(using alternative template without pressure, but with extra metadata). The Once the high-resolution reports have undergone extensive testing and teething problems have been resolved, they will be transmitted on the GTS at some point. They use a new BUFR template that includes height but not pressure (in preparation for future radiosondes that may not include a pressure sensor)have been fully accepted the reformatted TEMP reports will cease. An article on the O-B statistics for TEMP, BUFR and BUFR with treatment of radiosonde drift has been submitted to accepted by ASL (treatment of drift gives some improvement to the upper-level statistics, for consistent improvement the correct time has to be used as well as the correct horizontal location). Operational assimilation of the high-resolution UK reports (including treatment of drift) in the UKV system is expected to start in about April July 2014. Global assimilation of some BUFR data (radiosonde and surface) is expected to start later in 2014 following a period of monitoring.
Reference: Ingleby B. and Edwards D. 2014: Changes to radiosonde reports and their processing for numerical weather prediction. Atmospheric Science Letters, accepted