Lawyers for the man, who is in his 20s, said Hackney Borough Council's refusal to place him in a specialist Jewish care home in the Home Counties was dictated by the£146,000 annual cost of doing so.
His family also said their observance of the Jewish sabbath - which begins on Friday night and extends through the whole of Saturday - will make it impossible for them to visit him in Manchester, hundreds of miles from their home in London.
Today Mr Justice McCombe told London's High Court: 'This is a case of considerable importance that needs to be heard.'
The family's judicial review challenge to Hackney's stance is now likely to be heard as a matter of urgency during the legal vacation in August.
But in a blow to the family, the judge refused to order Hackney to pay a retainer to the Home Counties care home to ensure a place there is kept open for him pending the outcome of the court case.
The family's barrister, Andrew Allen, told the judge: 'The London Borough of Hackney's opposition to (the Home Counties care home) appears to be based on the consideration of costs.'
He said a letter from the council's legal department said the Home Counties care home was 'grossly expensive' and the council would not re-consider its position.
The barrister argued a move to the north of England would be 'disastrous' for the family and added: 'If he is moved to Manchester the family's current contact would be impossible.'
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