Bitter-vetch - Lathyrus linifolius
Short to medium erect, hairless plant with winged stems It has two to four pairs of leaflets. The leaves are linear to elliptical and ending in a point, not a tendril. The flowers are rich crimson-pink, turning bluish and then pale, 10 to 16 mm in long racemes. Pods reddish brown.
common and bush vetches have similar flowers

Stems winged, no tendrils, 2-4 pairs of leaflets
a photo of the whole plant, showing leaves and stem
Found around woodland edge and in damp grassland.
May to October.
Perennial.
Widespread but not really common in Britain - it is quite rare in East Anglia.
Local in Leicestershire and Rutland.
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