Small Dusty Wave

Idaea seriata
Small Dusty Wave moth Small Dusty Wave moth
The Small Dusty Wave and the Mullein Wave are similar-looking although both are variable with the (lack of) 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 cm 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.
Small Dusty Wave moth  Small Dusty Wave moth 
Small Dusty Wave moth   
 
Small Dusty or Mullein Wave moth
This one with somewhat more pointed left forewing looks closer to a Mullein Wave (Scopula marginepunctata) but is probably another Small Dusty.
   

Small Fan-footed Wave

Idaea biselata
Small Fan-footed Wave moth Small Fan-footed Wave moth
The Small Fan-footed Wave is also variable. The moth on the left above is definitely a Small Fan-footed Wave. However, the one on the right above, which is the same moth as on the right top line under Small Dusty Wave, could actually have been a Small Fan-footed.