What is this grass taking over my garden?

[DarlingCoffee]

Can anyone help please? I feel like it has sprung up out of nowhere! Thanks in advance.

Not enough detail in the picture to identify it. How tall is it? Are those flowers anything to do with it? If so, I’d hazard a guess at snowy woodrush, Luzula nivea, in which case you’d expect regular 6 petalled flowers, and, the defining feature, long soft white hairs along the edges of the leaves especially at the base. If not a woodrush, then possibly a sedge rather than a grass

Thanks @MereDintofPandiculation it is about half a metre in height. No flowers. There are from a separate grass. I was thinking it was a sedge as we have another variety of sedge also
thriving in our garden! I hate them!

If it’s a sedge, then it will have a vague feeling of “threes”, leaves coming off stem from three points when you look down at it. Stem may be gently or sharply three-angled. But it would be a challenge to id without flowers. On the other hand most sedges would be flowering so maybe it is a grass?

your hatred of sedges suggests your other one may be Carex pendula. Sedges are useful in the garden because they tend to be more shade tolerant, and fit into smaller spaces than, say, Miscanthus.

Another vote for carex