Hi there,
it can`t be a proper botanical grass (Poacea) with those seeds,
but was a good pointer,

grass like plant could be some Iris,
Iris foetidus has such interesting seeds,

not sure whether there could be other look-alike plants,

bye, Lin

Here is a link that might be useful: Iris foetidus

It's going to be Iris foetidus in the UK, Eilnan. A native plant but widely grown and self seeds in gardens. If you go back to the plant and break a leaf it will smell of burned roast beef. It's evergreen and a handy filler for shady dry corners. The type has dirty purple flowers but there is a yellow flowered form.

This post was edited by floral_uk on Tue, Nov 19, 13 at 12:05