Another common ruderal species found on light soils, this annual is Scarlet Pimpernel, Anagallis arvensis. Emma Orczy's eponymous fictional character is named after the plant, which featured on his calling card left to goad his enemies. It flowers for most of the year and belongs to the same family as the Primrose.
I must apologise for the hiatus in publication. This is due to a holiday on Gran Canaria which has inflicted deep lassitude through excessive hedonism. I am trying to overcome my predicament.