I've just had a new spi made by Grant Piggott (GP Sails) and the Luff is 375mm (14+ inches) longer than my old Landy spi, it is also flatter. Scooby's new GP kite will also be delivered soon and the luff is approx 50mm (2 inches) longer than his existing Landy.
Now I'll just have to see the advantages at EurOcat.