If the last one develops very small flowers, it might be a very invasive weedy one similar to the ones I have here. I'm not sure if they are 'dovesfoot' as those have quite nice flowers which are a little larger. They grow all through winter and seed like crazy (like most geraniums, they have 'explosive' seed heads, so do keep an eye on it!
A trowel in the hand is worth a thousand lost under a bush.
And there's a Hairy Bittercress (Cardamine hirsuta) in photo 4 (about half-way up, a fifth of the way across from the right. It's already showing its 'magnificent' white flowers. Often specialises in growing in the pots of hardy plants at the garden centre, and hence gets brought home.
Photo 4
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.