Tiny Flowers Tiny Bugs

I sat on my upturned bucket this afternoon near a clump of Dianthus deltoides. (On the bucket I can shoot from above and use my elbows on my knees as a tripod.)  I used to grow this from seed and retail it. It has become naturalised in our former car park.

The flowers are only about 8mm across and attract diminutive insects. I think the bug on the left is a bijou solitary bee but I've been unable to identify it. :(

In the middle is a thick-legged hoverfly and the fly on the right might be Helina reversio.