I think we have to be very clear on the fact that "Cupra" exists only within the UK when talking of Mk1 Leons. When the cars left the factory they were 1.8T Sport models, some with electric leather seats, ESP and rain sensor and some without. They only become Cupras when the
dealer in the UK sticks the little
badge on the boot lid.
It makes no difference what it says on your V5 logbook or insurance docs, SEAT were notoriously innacurate with the registration of these models and it varied from one
dealer to another.
If the car was made prior to March 2001 when Sport was officially dropped in the UK, its only a "proper" Cupra if it has MEMORY electric seats, ESP and rain sensing wipers, anything else is a Sport even if it has a Cupra
badge on the boot.