Something of an oversight not to have posted this common 'weed'. It has distinctive blisters on its leaves and distinctive out involucre bracts that look like hairy sepals (see top left picture). The seeds are 'beaked' which means that there is a stalk between the top of the seed and the pappus parachute. It's not terribly obvious but you can just about make it out in the bottom right seed.
And it is called Bristly Oxtongue, Picris echioides.
(Rose (see useful books) warns us that another plant has leaves with blisters: Green Alkanet. I'll look out for it and post if I find any.)