Off Route is a status afforded to Civil control once the military boys and girls have all gone to bed. It means that we do not have to coordinate any traffic with the military that is above FL195 that is also more than 5nm from the centreline of an UAR, therefore we start giving out some better direct routings. It normally happens in the evenings and at weekends. Your description however for 126.075 is incorrect. It should read all traffic west of (U)N866 as that UAR is controlled by 129.425 H24.