Its the fact that by allowing UK aircrew to fight against forces in Syria MOD has flipped the finger-this action in this region was effectively forbidden by Parliament in 2013.
If MOD are acting against the wish of Parliament then its a big deal and we slowly move again towards something we shouldn't be.
If you have a commission and you are fighting ISIL over Syria regardless of the markings on your plane you are doing so against the wishes of Parliament.
Its a big deal.