Would be better if most of the images on the three Q's were not on their side!

#1 is Euphorbia horrida again, #2 is another Melocactus, and #3 is likely to be Pseudopilocereus flexibilispinus.

Thanks for the comments, I hate not knowing what I'm growing.
Mg, I had to take the photo's lengthways to get the detail, due to the height on the columnar ones, I never thought about how they would turn out on here, Derek.