It's merely a defence ploy. An attempt to divert the Jury away from the fact that his client(s) are rabid extremist fuckwits. The other favourite is along the lines of "My Client was only in Bosnia/Chechnya/Iraq/Afghanistan as he was delivering aid for a Charidee when he sustained the GSW to his chest / shrapnel wounds to his legs" along with "Any items the Prosecution seek to prove to be 'intended for terrorist use' are merely souvenirs..."
Yeah, course they fucking are sweetheart.
Edited to add. This is usually the normal line (the original bored etc) when though the deadly intent is apparent, the actual Operation is so gobsmackingly amateurish, it makes the Girl Guides look like 22 SAS. Apparently, it's just 'Not British' to prosecute Incompetent, uneducated, ignorant and just plain thick Al Qaeda Wannabees to the fullest extent of the Law. Some of you think Four Lions is a Comedy. It's a fucking Documentary!