Snowy Inkcap?

At least one was on it's own, there was a cluster of three together, another couple were growing together and at least one 'strangler'/ tag-along on the outskirts of the cluster of three. All the fruitbodies were spread over an area covering three or four square metres on a North facing grassy bank. One of them has a more pure white cap (photos 2,3 and 4) whilst the others had brown scales/patches. The pure white one was growing on it's own. Here are are a few more photos of the same spotting http://www.projectnoah.org/spottings/23076277 (too many photos for one spotting):