Another unknown Noctuid

Another unknown Noctuid

Observation - Another unknown Noctuid. Description: Again, a moth I can't identify. As a scale, the channel in the wood on the left of the picture is 10mm wide so the moth is around 18-20mm. Clearly Noctuid I would say, but the combination of marks and almost purple colour leaves me stumped. Any ideas?

Again, a moth I can't identify. As a scale, the channel in the wood on the left of the picture is 10mm wide so the moth is around 18-20mm. Clearly Noctuid I would say, but the combination of marks and almost purple colour leaves me stumped. Any ideas?