Agree with Shasta daisy (Leucanthemum × superbum) likely for the first, second looks like lily-of-the-valley (Convallaria majalis), third is a euphorbia of some variety and the last one is Cuckoo Pint (Arum maculatum) I think.
A trowel in the hand is worth a thousand lost under a bush.
Could be wrong. Whilst I agree the 3rd photo looks like Euphorbia, the flowers look suspect. Is it woody and do the flowers smell? Looks a bit like Daphne Odora to me.
If you want rid of the thug (the wild arum), you'll need to dig carefully and deeply to remove the knobbly tubers, or they'll just grow again. I've been trying to get rid of a large patch in my garden today...
Since 2019 I've lived in east Clare, in the west of Ireland.
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The bottom one is Wild Arum and a real thug.