Firstly,for hair to appear straggly it has to be a certain length or it can't be described in that way. I don't think that Nevill had the hair length that would have " fallen forward ". Older pics gives him the look of having longer length hair but we're talking a few years later,when he was 60 in fact.
IF Nevill's hair had appeared straggly then that would have indicated wet hair-----showered ??
But where was the description ? A person with fair/dark hair ?
Oh! FCS, Lookout!!! The guy was a POLICEMAN, not a West End hair stylist. You can 'thin' what you like, but in my, too many years to say, time as a hairdresser, a hairdressing tutor, and an examiner, I DO know what I'm talking about. It's also a given, that men of his class, never, EVER change -providing the don't loose their hair- the hairstyle they adopt in their school days. I also know the difference between hair which is blood soaked and hair which is wet. Without seeing it, I KNOW Nevill's hair to have been blood soaked. I CAN'T because I wasn't there, categorically state that it was wet from being just washed.