Posted: 22/08/2013 at 19:55
I am surprised no-one else on the forum has tried to identify this plant, but it is not really that common even though it is widespread. In fact, two or three have just surfaced in my garden where they will stay until I tire of them.
I'm sure your right Peter, I expect the other IDers are as well.
none of these have cropped up in my garden this year, I think they originally came as seeds in a bag of compost, one or two cropped up on to many seed trays for it to be a coincidence