Greater Periwinkle, Vinca major, was in flower. It was an escapee from a nearby garden, from whence it had spread vegetatively by stolons, arching downwards and rooting where they touched the soil.
Pretty though it is, Vinca major can become a garden thug and is probably
best avoided. Daventry, 24 October, 2017
As far as I know it doesn't produce seed in this country for I can't ever recall finding any plants bearing seeds. It belongs to a largely tropical family, the Apocynaceae, although this particular species is native to southern Europe. The family is generally poisonous, often dangerously so, but one of its old English names - Violet of the Dead (or simply Flower of the Dead) - did not refer to the plant's poisonous properties but from the custom of adorning people condemned to death, with a garland of these flowers placed on the head. It is tempting to believe that this is the origin of its other English name of Periwig but I found, on checking, that the etymology does not support this idea. The Apocynaceae is a large family of plants and includes Oleander, Nerium oleander, which is also very poisonous.
I did a double-take a few yards further on when I saw a small shrub smothered in glossy purple berries, but quickly realised that it was a honeysuckle or, to be more precise, Wilson's Honeysuckle, Lonicera nitida.
Brought back from China by Ernest Wilson, Lonicera nitida, is most
attractive if allowed to produce its fruit. Daventry, 24 October, 2017