Would you place some art in front of it, poster print in style of your choice but large enough to cover it. Do you want long term or quick fix? There are many freestanding screens available too. The light could be changed for maybe a chandelier or other light fitting style reflected in the mirror. Just nice indoor plants on the sideboard with an arrangement of tall candle holders, picture frames and a bunch of beautiful flowers. shelving could be another option.

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.

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Hi Paul, I hear your collective frustration! my comment about light bouncing into your eyes was in response to your question about bouncing light onto your faces from a light placed behind the vanity (from memory). Have you seen Dr Renos comment here - still the most logical response to me. https://www.houzz.com.au/discussions/5148857/where-to-place-power-points-and-lights#n=5 So I'm going to go for side lights next to the vanity cabinet. Trouble is, my vanity is off-centre to the cabinet mirror, so I still have to sort that one out. Time spent really considering this is well worth it. I think LED downlights may very well cast shadows, sorry to say :-) and the next consideration is what colour temperature - warm white or daylight? For relaxing ambience (75% bathroom function) it will def be 3000 warm white for me, however for the vanity functions it will be 4000K (daylight) so I will probably get the vanity lights switched separately to the main room light, maybe put that on a dimmer... I know there are some LED bulbs available that enable the colour temp to be changed within the same bulb...