Laccaria bicolor Bicoloured deceiver.
Colin showed a nice Amethyst Deceiver recently and most will be familiar with (or have been deceived by) Laccaria laccata, the Deceiver.
An occasional find is this other Deceiver although the differences must be looked for rather carefully. The gills usually have a lilac or violet tint and the stipe has a violet basal tomentum (fluffiness!).
The spores are a not quite as globose (round) as those shown by Colin (L. amethystina) but more broadly ellipsoid.
This group were found at the end of September in Brechfa Forest, on a walk named Keeper's Path.