Centuary, certainly. Lesser Centuary would be difficult to tell from your photograph, Farmerkay, but possible. Not my neck of the woods so I would suggest that you forward your picture to the local botanical recorder (find him/her from the internet) and ask for a more possitive id.

I would need a close-up of the flower stalk and bracts to confirm an ID of Centaurium pulchellum. In that species there is a stalk between the bract and the calyx tube. In Common Centaury, Centaurium erythraea, the stalk is very short or not there at all.

Thankyou both, will see if it reappears in the lawn this year.

Looks exactly like common Centaury in one of my flower books, and the habitat is right too. The lesser one's flowers are less densely clustered. Culpepper recommended the common one for treatment of wounds and even for the removal of freckles!