standard kitchen counter height 900mm and table height about 750mm

As long as your dishwasher fits under the bench you’ll be fine. they stand 82-85 high!

I find 750 too high for a table. most chairs have a 450-460 seat height, and you really want no more than 250-270 between the chair and the table or you are going to need a thick cushion to sit on. So to my mind, 700-730 is the ideal table top range.

Bench top - what ever height you can comfortably work at without getting an aching back. Dining table - choose your chairs first and make the table height to fit them.

I was told to bend arms at the elbow then have forearms parallel to the floor with hands outstretched - that is a comfortable/ergonomic bench height for me. My sister did this and no sore back working in her kitchen:) The sink - arms stretched down and hands flat on base of sink = comfort. Chairs are made to suit the male proportions -higher- so generally to get comfortable women (as usually women are shorter from ankle to knee) - have to cross their legs so the hips can relax. (I have seriously thought of cutting just 2cm from our chair legs )

Bench height should depend on the heights of those who are going to be mainly using it. Go with absolute standard if everyone is average heights, but you might want to add a bit if half your household is somewhat over six feet.

I am only 5ft 2" tall and my husband is 6ft, so I find standard height benches a bit too high, especially if I am preparing/making food that takes a long time. In our previous house, the benches were lower, so obviously the person who designed it was a "shorty" like me. So if you are the "chief cook and bottle washer" I would suggest you have them at the height that suits YOU, after all, you are using them on a daily basis for a LOT of years! Good luck