UK
Currently (June 2014) the UK BUFR radiosonde data on the GTS is available as both a) reformatted TEMP reports (separate parts), and b) high-resolution (two-second) BUFR reports (using alternative template without pressure, but with extra metadata). Once the high-resolution reports 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 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 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