I like the name pom pom, but not sure either if that it the actual name. The petals are so tightly woven in this type. You did a good job on this one Lyn. tigs=^..^=

I think the "opening" of the petals is a bit bigger than the usual pom pom types. In any case this one is a beauty without doubt.

One and only. Gorgeous capture, Lyn.

---I am not really sure if this is a pompon or a ball type dahlia.---

Hard to determine, Lyn.

I've searched and found some information on a Dutch website.
Here's an attempt to translate what they've said:

"PomPon dahlia's have flowers of 4 to 6 cm in diameter and are clearly small flowered. They bloom extraordinarily rich in all colors except blue. The individual petals are imbricated over each other. They are often darker tinted at the top or at the edge, which further emphasized the spherical shape of the flowers. The plants grow well branched. The hollow, sturdy stems appear small, oval, shiny leaves that form an attractive backdrop for the flowers.

PomPon are caused by numerous intersections. They originally from Mexico with family members only frost sensitivity in common. Leaves and flowers fall off already at the first frost. Therefore harvesting the tubers in autumn, before the onset of frost. Cool and dry wintered in the house, they can be planted again the following year.

Peony flowered dahlias are the sisters of PomPon's. They have large, well globular flowers. The individual petals are as symmetrical as in PomPon, but they are more loosely arranged."

Thank you Cornelius. I think from reading that it may well indeed be a pompon as it is quite spherical. I found THISpage and it seems to resemble those shown there. The owner of the garden would know straight away. I have been invited back for next season's blooms so will make sure I am better prepared for getting the correct names :)