Cardiff Blues flanker Josh Navidi will make his international debut at the Prince Chichibu Memorial Stadium, in a side that also sees Tom Prydie (Dragons), Rhys Gill (Saracens) and Andries Pretorius (Blues), come into the starting XV.
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Tackling the effects of a new and emerging drug has been described as one of the 'biggest challenges in policing'.
The pit closed in 1996 with the loss of hundreds of jobs.
Pollen levels will remain moderate tomorrow and Tuesday, but will be lower on Wednesday.