In the US, there is currently one model Canterbury SE. I am pretty sure that the same goes for the rest of the world (but not 100%).
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What tends to differentiate the models in the prestige line is driver size, alnico magnets and the pepperpot waveguide, not to mention bigger, more elaborate cabinets. These features show up in the higher end models of the line. There's lots of info on the Tannoy web site that provides great detail.
Disclosure: I retail Tannoy Prestige speakers and demo the Canterbury model, Departure Audio.