Firstly I must apologise for the bad pictures.
I wanted to illustrate this colour of E.nisella which is not shown in the Sterling, Parsons Field Guide.
Recent DNA bar-codes of different colour forms show slight but consistent differences between the Poplar feeding group (now Epinotia cinereana) and the Willow feeding group (Epinotia nisella). Differences in both male and female genitalia have been found.
(Hancock, Bland, 2015)
From the latest A.B.H. checklist - "Prior to 2012 records of E nisella may include E. cinereana. E. cinereana has now been recognised as distinct from E. nisella: (Mutanen et al., 2012b)"
New ABH numbers are 49.255 E.nisella and 49.256 E.cinereana.
The photo below is of Epinotia nisella (Willow feeder). I hope this helps with anyone struggling with a brown Tortrix moth with a black/dark brown patch but this is still a variable moth!