Cut-leaved Dead-nettle - Lamium hybridum
Low to short hairy plant, leaves cut and irregularly toothed. Bracts similar to the leaves. Flowers pinkish purple 10 to 15 mm long, the corolla tube without, or with only a faint ring of hairs at the base.
Red Dead-nettle (Lamum purpureum)

Leaves under flower head deeply serrate or cut
Photograph of whole plant showing leaves under flowerheads
Arable and cultivated land.
March to October.
Annual.
Fairly frequent throughout Britain and especially in East Anglia.
Fairly frequent in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 112 of the 617 tetrads.
Leicestershire & Rutland Map
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MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015