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Ashya King's parents have been pictured after their release from custody, and offered thanks to the public for their support.
The couple's lawyer earlier said they would speak about at a news conference in southern Spain - the region where Ashya is being treated - tomorrow.
The National Court in Madrid said in a statement that a judge had ordered the couple's immediate release.
Labour leader Ed Miliband has called for Ashya King to be reunited with his parents and said the five-year-old cancer patient should receive "the best medical care".
Ashya King needs the love of his family and the best medical care. Hopefully latest developments mean he can be reunited with his parents.
Another high court hearing is to take place in the UK on Monday in the hope that Ashya King's parents will be able to appear either in person or by video link, a judge has ruled.
ITV News producer Vincent McAviney reports from court in London:
Judge directs adjournment to Monday with parents having legal representation + for them to be present in court or via video link #AshyaKing
Judges asks for CPS to attend on Monday unless arrest warrant hasn't been lifted and parents aren't free to attend #AshyaKing
Before the hearing, Brett King and wife Naghmeh will be expected to file a treatment plan for their son.
Judge directs the parents must put file and serve their treatment plan for #AshyaKing but 2pm Friday. Says no treatment is unacceptable
The Spanish hospital at which five-year-old cancer patient Ashya King is currently being treated will allow his parents to visit at any time, a spokesperson has told ITV News
Brett and Naghmeh King are due to be released from prison near Madrid tonight, after which they will attempt to reach the hospital, which lies 300 miles away in Malaga,
The grandmother of Ashya King says the "backtracking" of authorities has come "too late" for her family as the five-year-old battles a brain tumour.
Speaking before news of the parents' planned release from a Spanish prison, Patricia King told ITV News she just wanted her family home.
The parents of Ashya King are to be released from prison in Spain tonight and will travel to Malaga to visit their son, their lawyer Juan Isidro Fernandez Diaz has told ITV News.
The parents of critically ill five-year-old Ashya King face another night in prison, 300 miles away from their son, despite a clamour for their release.
As ITV News' Tim Ewart reports, prosecutors in Spain and Britain now want charges dropped, while the Government has vowed to send a top expert to assist the family
Ten men have now been arrested after a series of warrants were executed in Aylesbury and other Buckinghamshire towns this morning relating to child sexual exploitation.
Around 120 officers executed warrants at 11 properties from 7am. Seven warrants were carried out in Aylesbury, one in Milton Keynes, one in Buckingham, one in Chesham and one in Hayes, Middlesex.
A number of other addresses in Aylesbury were visited.