Hi Werby- and thanks for the further clarification.
I
had noticed that selecting different CMYK working spaces produced different results, but wanted to keep my question simple, in the hope that the answers would then be simple enough for me to follow!
As far as opting for one colour space or type of printing in order to aid the selection process? Here is the problem; this is for a set of guidelines that will be sent out internationally by the client so that different 'branches' keep to the brand colours consistently. Even if we were to specify the workspaces/printing processes to be used along with the various values/logos etc, I cannot imagine these sorts of specifics being adhered to. Meh!
The best I could do, I suppose, is aim for average- i.e., which is the most commonly used colourspace?
On the up side, I'm finally filling in some of the gaps my degree left me with, with your generous help. Thank you both!