Yes, its a weed, spent half the day digging these out in a garden. I can't remember what it's called though, but get 'em out.

Is it wild strawberry?

Thanks Bamboo. I thought it must be a weed. It's doing so well. I'm going to be really busy now, it's coming up all over the place.

I think it could be Mavis, it does have a small white flower.

No, it's not wild strawberry - I suppose I'll have to look it up now, lol! I think it's Geum urbanum - which is why its so easy to confuse this with modern hybrids of Geum, such as Mrs. Bradshaw, when they first start growing early in the year. Last year I dug out the Mrs. Bradshaw with these and then realised my mistake (fortunately, cos I just replanted it!)The leaves, when young, are vaguely similar to wild strawberry.

Thankyou. It does look very like a geum but when it started taking over an area of the garden I realised it was possibly something more sinister. :) I said it has a small white flower but maybe it could be yellow. I've been out and dug out swathes of the stuff but there's still a way to go. Could it have come from the wild bird seed?

I think it's a case of once you've allowed one to flower, it'll be everywhere the following year. They pop up with boring regularity in my part of London, but I don't think it comes from bird seed. Bird poo, maybe, but not bird seed, lol!