England and Wales' most senior judge has expressed his "great regret" following another delay in the appeal hearing of the killers of Cardiff A-level student Aamir Siddiqi.
Ben Hope, 40, and Jason Richards, 39, are both serving a minimum 40 year prison sentence for the crime.
The 17-year-old was stabbed to death in 2010 in front of his mother Parveen and father Iqbal at their home in Cardiff after Hope and Richards turned up at the wrong address.
Richards, who contests his conviction and prison term, is applying for permission for an appeal hearing to take place.A Court of Appeal (Criminal Division) hearing took place at Cardiff Crown Court last month, but proceedings were adjourned for six weeks.
However, the Lord Chief Justice John Thomas was today left with no choice but to postpone matters again as Richards' legal team had to withdraw their representation.
Hope and Richards' appeal hearing is set to resume in May.
An exact date is set to be decided by the court within the next week.