Richard - thanks for your reply. I've no doubt that your organisation is running happily, but - and it's a big but - the effects of fatigue should not be underestimated. For instructors cheerfully to work all the hours they can towards the great god of hours TT is something which needs some constraints - and the JAR 100 hours in the last rolling 28 days surely refers to any flight instruction, not just flight instruction for JAR-FCL purposes. Otherwise your FAA/JAR instructor could have flown 8 x 28 = 224 hours under FAA rules of which 100 would be 'JAR' and 124 FAA? Clearly that is totally against the spirit of the poorly-defined JAR - or did they assume that no-one could think that their regulation could be interpreted in any other way?
Thanks for your kind offer - I doubt whether I'll be able to find the time, but your generosity is much appreciated.
....I've also come across GPS-luddites who refuse to accept how useful a GPS is! Which is why all my ac have panel-mounted GPS which we teach people to use safely. I'm not a fan of 'moving map' GPS as they can encourage a bit too much head-in time; I prefer to have the navigation data fields set to GS, DTK, ETA and a mini CDI - because that will back up 'traditional' PLOG calculations!
....Sqn Ldr Handlebar-Moustache has never used anything as modern as a pencil with an eraser on the top - he still uses a slate and chalk and has his petrol bowsers hauled by horse!