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Definitely Gymnocalycium Mihanovichii

I'll start with this one Pilocopiapoa Solaris grown from Society seed in 1988

Cumulopuntia Sphaerica seems to flower well for me.

Looks like it might be Parodia (Notocactus) Herteri to me.

My Opuntia Acicularis has just opened one of it's flowers today:-

As A follow up to my original post this errant Pad/flower is still growing on the plant and has decided to produce a new pad as can be seen from the latest photo:-

My plant has just opened it's first flower for this Year:-

My seed grown specimen started flowering when it was about 4in in diameter and about 6in tall, now 10 years on it's 5in diameter and 12in tall and flowers every year. The plant is grown under full sun and normal watering with a winter minimum temperature of 4ºC - 5ºC. They do seem to need plenty of ...

Probably not very helpful but I can eliminate another manufacturer for you, it's not an Alton I have 2 of those and they are a completely different cross section.