Deep-brown Dart help

No Convolvulus Hawkmoth or Clifden Nonpareil for me here at sunny Tilehurst, but I do have this one query. 

From the 2 photos of the same moth can it be ascertained whether it is a Deep-brown Dart? I did try looking at the hindwing before it escaped and there did seem to be some indication of faint blackish dashes across the centre. Either that or my eyes were giving out at this stage having stared at it for so long.