This is a small fungus. The cap is  greasy and slippery to touch, but not slimy or sticky in dry conditions; in wet weather. caps may feel slimy.  The caps are yellow with faint striations towards the perimeter, and often with a translucent centre.  Older specimens are usually paler than young specimens, which are often orange. The stipe is also yellow, but not sticky,  The gills are broadly attached to the stipe (adnate) and often slightly decurrent.

It is often confused with Golden Waxcap, which is found in similar habitats; Golden Waxcaps are often taller and larger than Butter Waxcaps, but size and shape and colour of both species is very variable.  Gill attachment and texture of cap/stipe are the most helpful characteristics. 

Golden Waxcap, Hygrocybe chlorophana, has a sticky, not a greasy, cap, and gills are narrowly attached (adnate) to stipe.  There are several other species of yellow waxcaps

texture

Your notes must state the texture (sticky/greasy/dry) of cap and stipe and photos should show gills as well as cap

Found in short grass and lawns, often in churchyards and cemeteries.

Late summer to autumn

Widespread and fairly frequent in Britain.

Frequent in suitable habitats in Leicestershire and Rutland.