Greater celandines, a member of the poppy family. Lesser celandines, which flower somewhat earlier in the spring, are conversely from the buttercup family. It’s hard to spot what they have in common beyond being two of the may wildflowers which have yellow flowers.
Pink campions, like the white-flowered version, are hedgerow plants. Most of the ones I notice are growing beside canal footpaths.
Dunnock standing on a fence post by the footpath near the Wightwick Mill lock.
Lots of the plants which flower in early spring grow on the ground storey of woodland, and develop leaves and flowers before the the trees grow their leaves and monopolise the sunlight. Lords and ladies (wild arum) are one such species.
A very big and conical nest on one of the tall trees overlooking Compton Mill lock.
The yellow smudge in these pictures is a brimstone butterfly resting on a bush, right at the limit of my lens’s zoom ability. It’s a male: the females are paler. A few minutes later one was seen fluttering in the distance, likely the same individual.