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This is the 3rd species pair (the others are the Copper Underwings and the Twin-spot Carpets) where the "standard" ID feature is potentially misleading, i.e. the angle in the cross-bar on the wing. With the 2 Aplocera the solution, as David indicates, is to look at the rear of the abdomen (a lot easier than the alternatives for the other pairs). Otherwise, it cannot be said with certainty that this is one treble bar or the other.
I think I would probably add Uncertain/Rustic to the list where there traditional external ID features may not be as reliable as sometimes thought.
Lat/Lng: 51.2699, -0.1453
OS grid ref: TQ294539