"Technical grounds", in this case, means "the extradition request was never written by anyone the UK considers to be a valid authority". In denying his appeal, the Supreme Court based its ruling on treaties that neither party had argued over or been informed would be germane. Thus, there'll likely be another appeal before anything happens.
The law is finicky for a reason: it spells out exactly what rights the respective parties have. Were it not so explicit, and were the courts not so strict in enforcing it, the validity of the entire system would be called into question and judicial impartiality / defendants' rights would fly out the window.
People throw a tizzy when a murderer gets let off because they weren't read their rights, but if that didn't happen no one would have their rights read. It's just how the system keeps police and prosecutors in line. It's necessary.
The law is finicky for a reason: it spells out exactly what rights the respective parties have. Were it not so explicit, and were the courts not so strict in enforcing it, the validity of the entire system would be called into question and judicial impartiality / defendants' rights would fly out the window.
People throw a tizzy when a murderer gets let off because they weren't read their rights, but if that didn't happen no one would have their rights read. It's just how the system keeps police and prosecutors in line. It's necessary.