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Thanks Guys....did further adjustments of the 50mm screws yesterday in anticipation of fine tuning in the evening....and wouldn't you know it, cloudy skies in Sydney for the whole evening.
Maybe tonight, although storms are forecast.
I'm comfortable with the theory of the focuser replacing the normal function of a zoom lens...just not sure what movement is required in the primary mirror in terms of distance. With the mirror sitting at the end of the 50mm screws, this positions it approx 20mm further up the tube (and therefore closer to my camera sensor) than would have been possible with the original collimation screws.
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