This fungus gets its name from the greasy feel of the cap. It is very variable in colour, from dark reddish-brown to yellowish or pale grey, with a paler edge.  It often appears zoned, but can also be almost white when dry.   The cap may have a distinct umbo (central bump). The stipe is fibrous and flexible, tapering upwards towards the gills, with the base often covered in woolly hairs. Spore print pinkish-cream. 

Photograph from top down, in side-view and underneath to show gills; ensure your photo clearly shows the length of the stipe from gills to base.  You must note substrate and habitat.

It grows in leaf litter in deciduous and coniferous woodland

Autumn to early Winter.

Common throughout Britain

Common in Leicestershire and Rutland.

https://www.first-nature.com/fungi/rhodocollybia-butyracea.php