Oxalis of some sort.

yes it is one of the smaller oxalis.

Thank you Owdboggy :)

Thank you Seaburngirl, it looks so delicate.

Are they an annual?

Yes,Oxalis,and it will come up every year without fail. I love this plant,and it's easily split,and very hardy. I've had mine over 40 years, and some regard it as a thug,as it spreads , but it's easily kept in check,and it flowers all summer. A good gap filler,if you need to fill spaces :o) .

Could well be Oxalis hirta

Thank you bloomer I’ll have to put it on my to get list and give it a try.

Thank you Owdboggy I shall have a look and see if I can find it :)

I’ve also had that variety of oxalis for nearly 50 years. Whenever I move house a clump comes with me and it never fails. As Bloomer says it’s easily split and will grow into tidy clumps. I’ve lost track of the number of people I’ve given some to.
Mine now are getting a bit too big but come the autumn I shall dig some up.

I have a weed that’s followed me from the last house it has a similar leaf to this one but burgundy and a yellow flower.
They are lovely aren’t they :) thank you Arbuthnot.