Don't know about treason in itself, but wasn't that supposed London-based cleric recently jailed for inciting others to commit potentially law-breaking acts against the state? In this context, is there a significant difference between he and Galloway?
Expelled from the parliamentary Labour Party, banned from being an MP, and interned in an open prison for the duration of the war - these would seem to me to be sensible steps. If those with a more PC nature disagree, then how about the softer option of a free week fact-finding vacation in a Kuwait 5-star, on the same floor as a section of 42 Commando on pre-arranged R&R.