Can anyone ID this solitary fungus?

Can anyone ID this solitary fungus?

Observation - Can anyone ID this solitary fungus? - UK and Ireland. Description: Solitary fungi, cap is approximately 4ins wide and concave, with the gill structure clearly showing at the frayed edges of the cap. Height is around 6ins in total. No discernible smell. Found near a small stand of birch trees in grass. The stipe is shagg

Solitary fungi, cap is approximately 4ins wide and concave, with the gill structure clearly showing at the frayed edges of the cap. Height is around 6ins in total. No discernible smell. Found near a small stand of birch trees in grass.
The stipe is shaggy and there is a volva roughly the same colour as the cap and about half an inch deep.
The gills are long, straight and distinctly separate along their entire length, creamy in colour.
The colour of the cap goes from a pale brown at the edge through darker brown to an orangey/brown centre.