As a UK airline pilot, if I/my operator chose to go outside CAS, then what service I get/am offered is surely only going to be what's available. If the controller "cannot" offer a RAS or even RIS, fine, the problem is mine/my airline's, not the ATC units
If we want the protections of CAS, then fly in it - when in the military I've seen airliners routing through AIAA's, including needing abrupt avoidance, and just seemed bl**dy silly to me
