Thanks Jo. You've helped with some pieces of the jigsaw, and hardened my resolve to try again, with refined Internet search criteria.

By comparison with the prayers on your links it looks as if the words should have been "benedicere" (=to speak well of, i.e. to praise?) and "dignare" (presumably something to do with dignity). Found a healthy number of sanitate's, nothing resembling the slightly un-Latin-looking gustantes, although there were some praestantes. Time to go looking for that Latin babelfish site again.

Thanks again. Further contributions by all and sundry (omnia et sundri ?) still welcomed.