Blue flower on a grassy slope

Blue flower on a grassy slope

Observation - Blue flower on a grassy slope - UK and Ireland. Description: My daughter saw this small blue flower on the grassy chalk escarpment to the north west of Whipsnade Zoo, and was curious to know what it is? Thanks.

My daughter saw this small blue flower on the grassy chalk escarpment to the north west of Whipsnade Zoo, and was curious to know what it is? Thanks.