Thanks for the explanation here, I've been trying to work through some of them here, taking specimens and keying, as there is an absolute plethora of these at my place. They appear very variable and I've previously thought the majority are Hypochaeris but I think you're right and there are at least some Leontodon as well. It doesn't help that they are quite variable and quite a few of them seem susceptible to some sort of deformity which makes them difficult to ID.