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.
Disclosure: I retail Tannoy Prestige speakers and demo the Canterbury model, Departure Audio.