I'm pleased to see that this OLD post of mine (December 2008) has been attracting some new interest, and I'm grateful to those of you who have responded. I'm afraid I have nothing to add to the detail in my first post - except to say that the document may be later than the 1850s - but no later than 1876. I've been wondering why 'Bridgewater Hotel' and 'Mrs Robinson' (and another longhand word I'm not sure of) should have been written in longhand in the middle of a shorthand note. One explanation might be that the rest of the note is in German, or French, both of which languages my ancestor spoke fluently. James Page had, so the story goes, been born in London, educated at the Sorbonne and later at a commercial college in Hamburg. He prospered in Adelaide, where he migrated with a couple of his brothers in 1850: he was a shipping agent whose business specialised in the trade to and from francophone New Caledonia.
Thanks again for all responses IAN