An example of the procedures being useless :
A couple of years ago, RYR departs Stansted for european destination (Italy I think). Went Radio fail before reaching DET at FL70/80. Procedures state that it should have climbed to Req FL and carried on to destination via flight planned route. Did it hell! Did a 180 and returned to Stansted. Prob the best option in my opinion but not what the book say!