Essentially the same notification is also in the LGW (10.5.4) section of the TC Pt 2 for P37, he's 'B' unless he specifically tells you otherwise. In fact the same notification is in all the approach sections of the Pt 2.
Interesting! The Airfield MATS Pt 2 states that Police helicopters are to be treated as normal flights unless the crew specifically state that they are Cat A,B or Z, and that's certainly the way we treat them. Can't speak for the TC guys and girls, but I've never had co-ordination, or even got the impression, that a routine police flight is treated as anything other than normal.