On 30 Jan, 14:56, "Sue" wrote:
Could be Iberis sempervirens - that's a small sub-shrubby, perennial
type of candytuft, with masses of white flowers in spring. I find it
responds well to a good trim after it's finished, which keeps it neat.
Check Google images for pictures to compare with your plants.

Yes! But iberis are a bit smaller, I feel. Unless it hasn't been
tidied as you suggest hence it's straggly appearance ;o)