I have 3 of these that have sprouted in my border. We've only lived in this house a few months so I dont know if these are plants that were planted by the previous occupier or if its a weed.
I don`t know if they are in flower. My neighbour had a sycamore tree and I had dozens of those sprouting seeds over my lawn last year. The new owners have chopped the tree down now thank goodness.
Doesn't look like a sycamore seedling to me either, wrong shaped leaf as Prudie says.
But....it does look like a tree seedling, so I'd grub it up quickly before it gets too big.
The picture that the OP has put up has the same two little pea-shoot type leaves that sycamore seedlings have. The leaves then sprout from the middle of these.
They are the seed leaves and are similar with many plants.
So identifying the plant leaves at an early stage is difficult, as the leaves are still forming their adult features.
It does look like a sycamore seedling. Ive just been browsing googling and found a few pics that matched. There must be a sycamore around here somewhere. I have a tree, well its near enough a stump now, in the garden and these are shooting up around it. My tree (stump) still has a branch but there is blossom on it.
Sycamore have those whirly seeds that come down but it's difficult to say for sure. I have a Japanese anemone or something like that, its leaves are very similar and it grows straight from the ground, no surrounding greenery at the base, it has a daisy like flower (mine is pink). I don't know where it came from, except we had the garden mulched quite heavily last year.