The police have sent a letter, which on the face of it appears to be utter bollox, dated a day before the NIP, hinting at an excuse for serving the NIP late.
"The police" in this case will be a civilian department operated largely on the same principles as a sausage machine, funded by questionable practices.
Whilst I would not necessarily automatically trust any information provided by them, in the first instance (having already checked the V5C) I would be phoning the CTO and politely asking what is going on.
N.B. To my recollection, this is the second case we have seen with such a letter.