David,
Are you sure that Draft Mode Printing is not checked? FWIW, printing from Lightroom and from Photoshop CS 3 gives me identical results - at least to my eyes.
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Francois,
Thank-you for your suggestion, but yes I am sure that I was not in Draft mode - further research told me that the PPI number can be edited ( a very obscure pseudo edit box) and set to a max. of 450ppi - not really very high but enough to get rid of the worst 'jaggies'.
David