Out-of-date moth

Dave Carter has just sent me this photo of a "December" Moth that he caught in Windsor on 17 March! Not quite sure what is going on here, I can't find any other records of December Moth later than January. Has anyone else ever encountered on this late? (We did have another late record in Berkshire that was not supported by a photo and that I had to reject, but perhaps it could have been genuine.)

 

December Moth by Dave Carter

Phenology chart from the Upper Thames moth atlas