[AnnieK]

I think they should be allowed to serve any sentences in the UK if they provide the military with usable intelligence against IS (or whatever terrorist organisation they aligned themselves to when they left the UK). If they fail to provide information, withhold it or provide false information, they should not be allowed re-entry into the country (I don't think they should be tortured for the info either). I also think they need to be segregated from mainstream prison populations if they are brought back to the UK to avoid them being able to influence and radicalise others.