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Andreia Gomes was seven months pregnant when she escaped from the 21st floor of Grenfell Tower with her husband and their two daughters. The baby did not survive. The family have been telling their story - including how one of their daughter's was diagnosed with cyanide poisoning - for the first time to Newsnight's Katie Razzall. * We should stress we do know where the cyanide came from - whether it was plastics inside the building or from the insulation *