Two high-profile terrorist prisoners who were segregated for extended periods have won challenges at the UK's highest court.
Five Supreme Court justices in London allowed appeals by Ricin plot conspirator Kamel Bourgass and ''liquid bomber'' Tanvir Hussain.
In March 2012 the pair failed to persuade appeal judges that their treatment was unlawful.
They were alleged to have intimidated and bullied other inmates over matters of faith, and authorities in their respective jails had considered it was necessary to separate them from other prisoners ''for good order and discipline''.
Both men denied accusations that they tried to influence and dictate the beliefs of other prisoners.
The Supreme Court unanimously ruled today that their segregation was not lawful after initial periods of 72 hours.
The judges granted declarations in each case that the "appellant's segregation beyond the initial period of 72 hours was not authorised, so was unlawful".
The pair had also raised human rights issues - they claimed their rights had been violated - but that aspect of their case was rejected by the Supreme Court.
Bourgass, an Algerian, is serving 17 years for conspiracy to commit public nuisance by using poisons or explosives in relation to the 2002 Ricin terrorist plot.
He is also serving a life sentence for murdering Detective Constable Stephen Oake, 40, with a kitchen knife during his 2003 arrest at a flat in Manchester.
He injured four other officers during that attack and is serving sentences for attempted murder of two officers and wounding a third.
Hussain was one of three men convicted of a plot to launch suicide attacks on flights from Heathrow to America and Canada using liquid bombs made of hydrogen peroxide hidden in soft drink bottles. He is serving life with a minimum tariff of 32 years.
While detained at HMP Whitemoor in Cambridgeshire, Bourgass was segregated from March 10 2010 until April 22 and again from April 23 until October or November of that year.
Hussain was segregated at HMP Frankland in County Durham from April 24 2010 until October 2010.