In 2, we're told that it was 0007 hrs when Christopher found Wellington kebabbed.
The thought occurs, why was he out then? Quite possible he'd heard
In 167 I got the impression this was the first time he'd been out at night, and for that reason took two coats. Yet, in all his meticulousness, he did not mention a coat in 2 or at the police station.
PS I haven't got past 173, so please so spoilers.