The publication of the Grenfell Tower Inquiry's first report has been delayed until October - a decision blasted today by victims' families as 'disgraceful'. Core participants, including survivors and those who lost relatives in the deadly blaze in West London in June 2017, were expecting it would be released this spring. But in a letter they were told today that writing the report 'has proved to be a far more complex and time-consuming task than the inquiry had originally anticipated'. The fire at Grenfell Tower in North Kensington, West London, resulted in the death of 72 people It said: 'The chairman will be in a position to write to the Prime Minister with his final report after the parliamentary recess, for publication most likely in October.' The report follows the first phase of the inquiry, which is limited to what happened on the night of June 14, 2017 when fire ripped through the tower block. The huge blaze at the building in North Kensington resulted in the death of 72 people. More than than 70 others were injured and 223 people escaped. Caroline Featherstone, solicitor to the inquiry, said in the letter that plans for the second phase are continuing and it is still due to go ahead in January 2020. Natasha Elcock, chairman of Grenfell United, the group for survivors and bereaved families, said: 'It's disgraceful the inquiry have underestimated the complexity of the evidence that was produced in Phase 1 and have further delayed the report until autumn. More than than 70 others were injured and 223 people escaped in the blaze in June 2017 'That we are only finding this out now, when we were expecting the report to be published ahead of the two-year anniversary. Shows how they continue to disregard survivors and bereaved through this process.' Grenfell inquiry failed us, say angry families Angry survivors and grieving families from Grenfell Tower accused the public inquiry into the tragedy of 'failing to deliver' earlier this month. Lawyers said families had lost faith in the multi-million-pound inquiry after many delays, and felt it had shown 'a total lack of respect' for the 72 people killed in the tragedy. An interim report was expected in spring but has not been delivered and the inquiry's second phase is not scheduled until next year. Criminal charges are unlikely until 2021. Lawyers representing about 90 people have written to inquiry chairman Sir Martin Moore-Bick to voice concerns. Isabel Bathurst, of Slater and Gordon, said: 'The families have lost faith in the inquiry. They feel it is failing to deliver on its intended purpose.' The letter said the report will set out in detail what happened on the night of the blaze. 'That involves an almost minute-by-minute description of how the fire started, how it spread and what was happening on each floor of the Tower,' it said. 'It also involves a detailed description and analysis of what was happening in the incident control room and on the ground, as well as the response of the emergency services and relevant organisations.' Inquiry chairman Sir Martin Moore-Bick has previously said he does not consider it appropriate to make interim recommendations ahead of the report. But some survivors have become frustrated that safety recommendations, such as abandoning the 'stay-put' policy for buildings over 10 storeys, are so far yet to be implemented. Ms Elcock said: 'It is survivors and bereaved that fought to get dangerous cladding banned. 'There is still no change to the stay put policy, people are living in tower blocks without sprinklers and social housing residents across the country are still be ignored and mistreated. Relatives, survivors and friends of victims of the Grenfell Tower fire hold a vigil in June 2018 'It appears, despite everything survivors and bereaved said in the weeks after the fire, the inquiry has woefully underestimated the catastrophic complexity and scale of the failures that led to Grenfell. 'They also continue to woefully underestimated the needs of bereaved and survivors.' She added: 'We want the inquiry and the criminal investigation to be thorough and to get to the truth, but there must be no more delays. 'We are living in a limbo, increasingly frustrated and we need to know there will be some resolution soon. A slow justice is a painful justice for all of us. Earlier this month it was revealed that unsafe Grenfell Tower-style cladding on private residential high-rise blocks would be replaced by the government at a cost of £200million. How Grenfell Tower appears now after the blaze, with a banner saying 'Forever In Our Hearts' The Ministry of Housing said it was forced to step in after 'private building owners failed to take action and tried to offload costs onto leaseholders'. The campaign to see the material stripped from all residential blocks has won support from celebrities including Adele and Stormzy. Latest Government figures show that 166 private buildings out of 176 identified with the cladding after the fire in 2017 have yet to start removing the material. Developers and building owners, including Pemberstone, Aberdeen Asset Management, Barratt Developments, Fraser Properties, Legal & General, Mace and Peabody, were highlighted for having fully borne the costs for their buildings.All rights reserved for this news site dailymail and under his responsibility