Hairy Bindweed looks like Large Bindweed C. silvatica
and forms similarly rampant colonies in hedgerows and road verges. Typically, it has large pink and white striped flowers and strongly inflated bracteoles. Unlike C. silvatica, its leaves are nearly parallel-sided in the lower third and a careful search of its petioles and pedicels with a hand-lens will always reveal short hairs, though they may be few in number.
It is common around Amesbury and appears to have spread along the A303 nearby, where it can be spotted on the verges near Stonehenge. It is likely to be under-recorded elsewhere.