Confidence: I'm as sure as I can be.
Notes: Ooops! Now we have the second photograph, showing the underside, we see it has a ring! I did think about Suillus originally, being as the commonest yellow bolete is indeed S. grevillei, but for some reason I thought the cap looked dry. Looking again, at highest magnification, it does after all appear to be viscid (as in most Suillus species) and also it looks like some of the grass leaves are stuck to the cap. By the way, credit to Thistle for clearly indicating that the second photograph has been added. It is a problem, at times, that photographs are added without such indication, after identifications have been made! (And in one infamous case, discussed in the forums, a photograph was replaced by something entirely different after identifications had been made.) So my thanks to Thistle for making the addition clear here. Hmmmm, shame it isn't a yellow X. ferrugineus, I rather liked that idea. At least my decision not to launch into a discussion of X. citrinovirens has proved correct. As this is S. grevillei, there must have been a Larch nearby.