Essex already operate out of Rochester and have done some for a couple of years. An office to operate out of, a pad, fuel, Easytask connection, kitchen.
I dont think they will be moving there permanently just using it as a FOB and staying at Boreham. When tasked in Kent they then land at Rochester and await further tasking.
NPAS will be a new name but ops normal for them, remember NPAS really means RPAS, Regional Police Air Support!