SPEEDWELL

A blue haze amongst the grass is probably down to the flowers of the Germander Speedwell or Bird's Eye Speedwell (Veronica chamaedrys)  which spreads itself into a patch by rooting its trailing stems.

 

All speedwells are blue with two white stamens like drumsticks.  Germander Speedwell has one of the bluest and biggest flowers. 

 Some of the recent arrivals to Britain such as the Persian Speedwell or Common Field Speedwell (Veronica persica), native to Iran, are weeds of disturbed ground.  It's more weedy and has paler flowers.

 Germander Speedwell with its white eye in the centre is the most attractive in my opinion.