Leskol is the lowest one i think, it was alright too not sure how it melts.
On the site the Ni per 100g is 280 Kcal, 1.3g satfat compared to normal cheddar at 410g, 21.7g sat fat!
adding a tiny bit of mustard is meant to make cheese taste cheesier so thats always a tip but if you really like cheese it might be worth just having less of something really strong so its more satisfying!