Scarlet pimpernel

Every time I decide to cut down my neglected weedy wildflower patch I discover something new has started flowering. Deep down in the grass I found this tiny red flower. It looks a bit rose like but you can see from the blades of grass that are the background stripes of green that its only about 2-3 mm in size. Alas this may be the last 'blip' I get out of this patch of garden for a while as its going under the mower soon!
PS discovered its a scarlet pimpernel.