How do you make 'light' mayonnaise?

[SatNavSaysStraightOn]

Heinz light mayonnaise is dairy free

The one you listed previously wasn't which was what I was going by. It's why I have to shop in person in the supermarket and not allow anyone else to do it. (Even hubby fell for dairy on a tub of fresh coriander when fresh wasn't available.) Dairy gets everywhere unnecessarily in most cases imo.

Hellman's Light - 264 cals per 100g
Water, rapeseed oil (25%), spirit vinegar, modified corn starch, sugar, salt, free range EGG yolk (1.5%), cream powder (MILK), citrus fibre, thickeners (guar gum, xanthan gum), MUSTARD flour, lemon juice concentrate, antioxidant (calcium disodium EDTA), natural MUSTARD flavouring, paprika extract, sunflower oil.

(My bold)

I've always not been a fan of diet stuff. Childhood issues with parents on low fat diets or whatever the next diet fad was... much rather have less of what I like than more of something horrible. The only exception has been my lemon cordial which is actually nicer on the sugar free version labeled diet than the original.