Thank you for all the help!! Quick note, the cactus hasn’t been at that stained glass window for a few years now - as I mentioned I haven’t been looking after it this year but I’ve been reassured it has been at a south facing window!!!

I’ve had this cactus for around 8 years (see first pic)- it’s been repotted twice. I last repotted in 2020 and since then it has grown massively. It was able to support itself (3rd pic) until very recently. What is the best solution for this ? I’m aware it probably needs a wider pot but I was away d...

Around 17 inches, I’ve had it for around 3 years.

Repost with a better picture !

I've had it for around 3 years now, it grows quite slowly (its around 17cm now)..

I think i'm struggling to identify it because of the long spines!

Thanks for any suggestions.