? less than 2mm in diameter we are talking small

Bet it's a veronica again..lol.

Can't imagine what it is. I'll try a look in my books in a minuit.

Definately not a Veronica. It's not a veronica-shaped flower.
I wonder if it's Field Madder - Sherardia arvensis
A prostrate hairy annual. Square stems. Whorls of 4 - 6 stiff leaves. Flowers in small heads, surrounded by leaf-like bracts ... tiny, pale purple, with a slender corolla tube.

Oh..I thought you had it Hywel.. but the leaves are wrong and it does not grow upright.. I will try another pic with something for scale..the flower does look right though :/

It's gorgeous by any name, sorry can't help...

Where did you find it, P? Such a delicate colour. Lovely.

It is on a rather neglected verge by the entrance to the infant school...I will wait till it is closed before taking another photo or I will be arrested..

having had a good look again at Hywel's ID of

"Field Madder - Sherardia arvensis" I think he has got it again...

I thought that was it. It likes sprawling on waste ground.
:o)

:)