To me, both of the handbook versions say the same, just different words. Both say to me that only problems resulting from mods or non Morgan parts will be excluded from the warranty, which I think is fair enough. There's nothing to suggest that the whole vehicle warranty would be void, which is backed up by Jay's experience with the exhaust.
Given the choice, I'd put my money on the warranty statement in the handbook rather than a magazine article read
Ian


3.7 Roadster
4" Ruston Procter SD Tractor
1905 Merryweather steam fire engine