I found this in my studio this morning a type of plume moth.
This moth is distributed widely over much of Britain and Ireland, and, since the 1990s, has become much more frequent, including in gardens.
Like its relative, A. punctidactyla, the hindwing has two patches of black scales on its dorsum, which protrude when the rest of the hindwing is covered by the forewing. Amblyptilia acanthadactyla may be distinguished by its warm reddish brown colour from the greyish brown of A. punctidactyla.
There are two generations, with moths on the wing in July and again from September onwards, flying after hibernation until May. The adults are attracted to light…. UK Moths