Found this site some time ago and meant to post it here
http://theseedsite.co.uk/weeds.html
Excellent site to identify weeds as seedlings so you can whip 'em out ;)
That would have answered a question last year.
We are unlikely to have flowers seeding, so it's the veg bit that I have to think of. I have 2 rules. If it's not in a straight line, it's a weed. If it's growing well, it's a weed!
That's a good site mimi, can you get that put onto Wiki?