The Foreign and Commonwealth Office (FCO) advise against all travel to the exclusion zones around the Fukushima Dai-ichi nuclear facility identified by the Japanese authorities. See Fukushima
The tropical cyclone (typhoon) season runs from June to December with most activity between July and September. You should monitor the progress of approaching storms and follow instructions issued by the local authorities, including any evacuation orders. See Tropical cyclones
There may be some disruption to transport and other infrastructure in the parts of north-eastern Honshu most affected by the 2011 earthquake and tsunami. Check with the local authorities or your travel company before you go.
There is a continuous risk of earthquakes and tsunamis throughout Japan. Latest warnings and advisories are published on the Japan Meteorological Agency website. See Earthquakes and tsunamis
The Japanese government introduced a new residency system for foreign nationals in July 2012. See Local laws and customs
220,000 British nationals visited Japan in 2014. Most visits are trouble free.
There is a low threat from terrorism.
Take out comprehensive travel and medical insurance before you travel.