So, I went into my garden about half an hour ago and came across what I can only describe as a Giant Dandelion... it has a dandelion head about 2cm across, and large dandelion leaves... the difference to all of the other ones I've seen is that it has a stalk over a metre high that its about 2cm thick. Can anyone tell me what it is? I live in the north-west of england if that helps?