The 'clover' like one is oxalis, and if you don't want it then digging it out is by far the best method as it has little bulb like structures that defy being pulled up and carry on growing. The other is a sedum, probably biting stonecrop, sedum acre. Easy to pull out and eradicate, if you need to.

I've been trying to grow oxalis without success! I lost a clump a couple of years ago and although I planted some bulblets this year there's no sign so far. A weed is only a plant growing where you don't want it. Oxalis don't grow wild in the UK as far as I know though they do in France. so whether you want to keep it or sling it is up to you. Its very pretty later on when there are more flowers.

I've never seen the sedum growing as a weed - it might be a leftover from whoever had the garden before you. They do well on poor thin soils and rockeries. Digging it out might be more successful than pulling it up as it's probably growing again from the roots. Your weedkiller might work but as the surface of the plant is waxy to prevent moisture loss in dry conditions it might just run off.

Great! Thanks for the replies.

The Sedum is more like S. album than S. acre.

Thanks having googled it .i agree it looks very much like I have s.album growing like mad in the front garden!

The sedum is very common here in the south, growing on the tops of flint walls and in gravelly places. It makes a very pretty sight when in bloom but I agree, it can be a nuisance in the wrong place!

Interesting, Pennyfarthing!