hi Paul, Dulux does make British Paints and Mitre 10 'Accent' is the same as British paints, all K-Mart paint is made by Dulux but not the same quality, same as other big stores who sold paint weren't the 100% quality, that's why they were cheap.
When I used to paint houses/ flats I would go to my paint dealer and buy the tradesmen paint made by Solver, because it was slightly cheaper, but I also used that paint for my own home, however for the outside I used Solaguard, but Bunnings don't sell that anymore, there was some disagreement in management, but my paint store sold it and got 10% off all paints.
Any paint, except those cheap brands, will be OK as long as the preparation is done, that's the hard part.
There has been an acrylic paint that can replace painting in enamel, it dries just as hard as enamel to use on window sills, doors, jambs so easier to clean up with.
Haymes is the premium product but if you live by yourself it maybe going overboard price wise, Dulux wash and wear is good, and Mitre 10 Accent is made by Wattyl, although who knows these days one company buys someone out and then take over by another company.
If you have a local paint shop they may have specials on all different products, just be aware of them trying to sell you something just to clean out their old stocks, they can be like car salesmen.
All you want is to have a paint where you can wipe food marks off without leaving a definite mark, but most paints do this anyway.
If you have a fan in your bathroom then you can use an acrylic paint, and in old houses the kitchen, laundry would be painted in enamel, so it needs to be washed down using 'tricleanium', much better than sugar soap, and there is an acrylic paint to paint over enamel walls in preparation for using acrylic paint.