Anyone entering the 20km area illegally is liable to a fine up to 100,000 yen (approximately £735) or detention. This will come in to force at midnight (local time) on 21 April.
We also advise against all but essential travel only to those areas in north east of Japan most affected by the earthquake and tsunami.
Outside the 20km around the Fukushima Daiichi nuclear power plant, Japanese Government advice remains unchanged. Between 20-30km, residents have been instructed to remain indoors or leave.
As an additional precautionary measure, we are advising British nationals to remain outside a 60km radius of the Fukushima nuclear facility, rather than the previous 80km radius. This is based on the latest scientific advice from the Scientific Advisory Group for Emergencies (SAGE).
Any British nationals within 60km of the facility are advised to leave the area or take shelter indoors.
The British Embassy in Tokyo is no longer distributing iodine tablets. This is based on the latest scientific advice from SAGE that iodine tablets are no longer needed as a precautionary measure.
The consular counter at the British Embassy in Tokyo will be open from 0915-1415 Monday to Friday. If you require emergency assistance outside public hours, please call 03 5211 1100 and follow the instructions.