Can you name this white flower?

[StaryD]

Hi all, this has really got me thinking.
I inherited this plant on my allotment and I have no idea what it is.
Can anyone give any insights to what it is?

[Linnea]

it's an iris. I've seen them in lots of garden centers this year but can't remember the rest of the name!

[StaryD]

I know the purple and yellow ones are Iris, but I think the small white flower at the front has a different name, but I could be wrong.

[binley100]

The creamy coloured one at the front is a sisyrinchium striatum .......they're lovely

[Jeanied]

Sisyrinchium.

[binley100]

Snap Jeanie .

[StaryD]

Thanks guys, I have hundreds of them, I might have to split them this autumn as they have kind of taken over in the last year.