Greater Periwinkle?

Greater Periwinkle?

Observation - Greater Periwinkle? - UK and Ireland. Description: From the size of the leaves and flowers, I think this hedgerow plant should be Greater Periwinkle but the leaves do not have hairy margins, so I'm not sure.

From the size of the leaves and flowers, I think this hedgerow plant should be Greater Periwinkle but the leaves do not have hairy margins, so I'm not sure.