The difference between juice and nectar

I have been buying the Kist Mango Nectar quite frequently, the label says it contains fruit juice and it tastes good, very natural.

My brother however alerted me to a subtle difference in labelling: nectar and juice are not necessary the same.

If a product is described as "juice" it must contain 100% fruit juice or pulp. If it is described as "nectar" it contains some juice but also a lot of sugar water. In the UK the regulations a product need only contain 25%-50% of juice  (depending on the product) to qualify to be described as a "nectar".

Wonder what the local regulations are and how much juice actually goes into these products?