Firstly, an update on the Hairy Bittercress from 21st February. Now it has developed seed pods.
And this is object lesson #2 in observation. The leaves round the edges of the picture are Germander Speedwell, so I thought for a second that I had the third flowering Speedwell for this year. Then I spotted the paler rounded leaves in the centre. So the flowers are Slender Speedwell, again.