standard sort of cabinets that can be installed on the outside or, better still, inside the wall cavity...many sizes and prices available some with matching vanities at most tile and bathroom shops or hardware stores. Bunnings even has one on their website with a round mirrored door and there are plenty of variations to view online. We have several including one with three mirror doors (hinged so that i can see the back of my hair) and a custom made one to fit an akward spot but our good quality off the shelf one was much cheaper (and i think nicer with glass internal shelves) than custom made...good luck with your search

Thanks for the suggestion, LesleyH, but actually wanting it for the practical stuff I'd like to get out of sight (electric toothbrushes, toothpaste, etc). We like the simplicity of a mirror along the full length.

We too live in a cold winter climate with our bathrooms all on the southern side and faced similar issues as you do. One smaller bathroom does not have a window so we put in a Velux skylight which provides amazing natural light through the day. This may not be to your liking, especially if you have a period home. We also use heated towel rails and under tile heating (just enough to take the chill off and stop mould) in winter. Although we have a light in the shower recess, a bonus is the large fixed shower head with inbuilt LED, which at night gives the feeling of showering under moonlight. We chose light colours and mirrored recessed cabinets to reflect as much natural light as possible.

So much nicer having lost the public washroom feel by replacing those hung basins with vanity cabinets. Can I suggest you tile the boxes encapsulating the waste pipes. It will make them disappear more if in wall tile