Most cases of ac losing comms in CAS the UK occur not due to failures of equipment but because pilots select the wrong frequencies on change of controller, and, in the case of transatlantic flights, leave the primary frquency to seek Oceanic clearance.
Under such circumstances, I believe it is imperative that pilots select VHF Guard 121.5 and make contact with one of the D&D Cells. I don't believe this goes against what has been suggested in the ATSIN13 mentioned previously. In the mean time, continue on your approved route.
Regards
STH