I went back to job we had completed to fit some outside lights, the client asked if I thought the cooker hood was right.they could have, but depends on if they was following any guidelines... cabinet heights have guideline heights set by the manufacturer you are "supposed to follow" to account for different height people.like cooker hoods.. most people fit them at any height, but building regulations specify a height above the worktop for them.
Part F Ventillation
Walked into the kitchen and she demonstrated the problem, the cooker hood was so low that when she had a saucepan on the hob she could not look into it, she was looking at the top of the hood, hahaha.
As far as I know they got the fitters back who said they always fit them at that height, well first one I have seen that low.