I would guess:

1- Achillea
2- London Pride

Don't know the last one, but have seen it on here, so someone will know.

2 is London pride as said above, sorry don't know the others x

I think 3 is Sysrinchium

1 Yarrow a wild flower
2 London Pride, Saxifraga x urbium
3 Going over Sisyrinchium

Sisyrinchium striatum to be accurate.
Not so sure the first one is the wild version of Achillea, there are pale pink cultivated forms around.

True there are Owdb.

1 is Achillea or yarrow

2 is London pride or saxifrage x urbicum

3 is sysyrinchium

The sisyrinchium drops seed easily, and they keep popping up the next year over quite a wide area.
No always welcome.

Thanks for posting this question as I've just been given some sysyrinchium and the donor wasn't sure what they are called so I can appear "in the know" now ha ha! :-)

And another thank you for posting this question as I'd been wondering what (yet another) mystery plant was that had popped up in my garden - it's the Sisyrinchium!

Sysyrinchium is shallow rooted and easy to grow. It is a pull it up, discard some, and shove it in a slot plant. Main fault is, some of it goes black after flowering. Good gap filler, if you like strap leafed plants.

Wow Thanks everyone! Yes the first one is a pale pink colour, which threw me cos I thought it was similar to the the white wild flower. I've heard of London Pride but never seen it but the sysirinchium is totally new to me...Cheers all !