Thanks hanazono,
I think they're absolutely beautiful looking plants, surprised to hear that it will elongate honestly thought it would remain more ball shape but guess when it does elongate it will show off the white patterning much better.
The Japanese hybrids are among my favourite cacti, the shapes, textures and colours are in my opinion unsurpassed.
Hydrophobe: thanks for the mention, I missed out unfortunately have been really crook for the past week or so, first day out of bed in a week today. Thankfully the cacti can be left unattended for that amount of time with ease!