No, not without a close up. Interesting. I can see Fat Hen (greyish flowerhead to the right), and Annual Dog's Mercury (bottom left, satiny leaf), but the yellow flowered thing doesn't ring a bell. Close up of flower tmrw? Phil J

Its Gallant Soldier (Galinsoga).

Fractal: Thank you very much for identifying this weed :-) I pulled up "tonnes" of it today on the allotment!

Philjeffs: Thanks for identifying the others as well! Fat Hen & Dog's Mercury are just as bad! If you were to give me a penny for everyone I've pulled up in the last couple of days you would now be poor man & I'd be rich!!! LOL! :-D