Hellman's mayonnaise, which everyone in the UK loves - is crap. It's tasteless.
If you live in the UK and like this type of mayonnaise, get Heinz. There's a huge amount of difference in flavour. It's got 5x more flavour and it's creamier.
Or even better, use fresh homemade mayonnaise as soon as it's made. You can eat it off a spoon, it's that delicious and exceptional in flavour. I would rate it as 20x better than jarred mayonnaise. It's somehow lighter, yet creamier, and more flavoursome.
Since I discovered I had an egg allergy, I haven't been able to taste mayonnaise. Honestly though, I don't miss it nor dairy (I'm not allergic to dairy, I just don't crave it anymore. Vegan squirty cream actually, unbelievably, tastes better than the regular one).
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I've left WP.