Gertrude - twin IFR GPSs and twin glass screens is a reasonable amount of redundancy. There is a moving map GPS in the flight bag as well. In all seriousness a dual screen, dual GPS failure is enough of an emergency to land asap if for no other reason than almost certainly there is an even more serious underlying problem. The PLOGs gone and its a diversion. With enough redundancies I am not sure there is any merit in a handwritten plog and I am also not sure how it will help.
Sorry for the topic drift and as for London Info - its a brilliant service. Well done to those who man the service and thank you.