Amethyst deceiver?

Another fungal challenge from the woods of Wimbledon Common.

This is likely to be an 'Amethyst deceiver' (Laccaria amethystina) which is technically an edible mushroom that is easy to identify due to its peculiar colouration. However it is short on flavour and can bioaccumulate toxins from soil in the locality. However, it is not one that I am familiar with and there was just the one small 3cm cup so not much cop for a fry up.

The name is intriguing though and not a little worrying.

The fourth in my fungal blip series. Previous fungi:
1. Stinkhorn fungus
2. Puffball
3. Yellow stagshorn fungus