As I'm not sure this is 100% accurate or up to date, it seems the Cupra is a rare beast.. I was only looking at the DSG but I'm sure there's even less manuals.
Link: https://www.howmanyleft.co.uk/vehicle/seat_leon_cupra_280_tsi_s-a#
Link: https://www.howmanyleft.co.uk/vehicle/seat_leon_cupra_280_tsi_s-a#