mystery blue flower

mystery blue flower

Observation - mystery blue flower - UK and Ireland. Description: 5 blue slightly-overlapping petals with white star at centre around a small raised hole with short inobtrusive stamens. 5-part calyx sheilds the corolla topped by the flat open flower. Leaves hairy, opposite, lanceolate. I didn't examine the largeish bl

5 blue slightly-overlapping petals with white star at centre around a small raised hole with short inobtrusive stamens. 5-part calyx sheilds the corolla topped by the flat open flower.
Leaves hairy, opposite, lanceolate.
I didn't examine the largeish black seeds - I should have.
Any ideas?