The Small Dusty Wave and the Mullein Wave are similar-looking although both are variable with the line patterns they show on the peppered buff background. Both have a dark spot in the centre of each fore and hind wing and fly at the same time of year. The Mullein Wave is a little larger (12-14
mm forewing rather than 9-10) and the forewings end in a point/angle like those of the Riband Wave. Because of the slightly rounded edges to the forewings, these are defined as Small Dusty Wave moths.
Wingspan 19-21mm; UK flight time May-Oct.
This one with somewhat more pointed left forewing looks closer to a Mullein Wave (Scopula marginepunctata) but is probably another Small Dusty.