Large white mushroom found amongst woodland undergrowth

[lostplanet]

as above this mushroom is 170mm diameter brilliant white all over found on the edge of forest tonight, has a very slightly musky smell pics to be added, white slimy spores.

I don't intend to eat it unless I am completely sure what it is,

the closet thing i can find in my book is st georges mushroom but maybe a bit late, any ideas??

 

[lostplanet]

My first concern is that it is a' Death Cap', is this possible?

 

[Harvestman]

Looks Amanita-ish to me. Death cap, destroying angel, etc. No way would I be eating that.