Ben Emmerson QC - Marina Litvinko's lawyer has severely criticised the government's decision. He will seek judicial review.
He calls it "a repeated catalogue of broken promises[...] disastrous catalogue of indecision at the heart of government. [The government] has been paralysed by indecision".
Mr Emmerson says his widow and her son have been treated with "utter contempt" and in "the ultimate shabby way". He called it a "catalogue of disrespect".
More top news
CCTV footage is said to show the moment a laptop containing explosives is handed to the suspected suicide bomber.
Two-year-old Sophie spent six days on life-support after battery acid burnt a hole in her lung, but has since made a full recovery.
Storm Imogen will cause problems across much of the south today, but it will be calmer in the north.