Madam to you!! the white one was actually a massive mo'fo, there are some of these which are tiny normal size flowers but i have seen them huge giants, i'll have to do better in capturing it with something to scale most of these huge ones are on steep banks by rivers or in a crap ton of nettles
Giant Hogweed. Don't be tempted to "adjust" them for the photo's, they can cause burning/blistering and a very nasty, painful rash that can last for months. That's an old fisherman's tale, as I am an old fisherman.