Right off the bat they're introducing elements from a soundworld foreign to UK drill; the auto-tuned, reverb-drenched liquid metal warbling.
That reverb lends it depth. One thing that ad lib rap does is situate voices geographically. Some voices are right up close, some are miles away behind a hill, some are down a well... It's all indicative of a bigger sound than UK drill. A chorus of voices. Maybe all contained within one mind. A fractal mind containing more than one persona within it. A mind that's used to having others thoughts constantly broadcast to it by incessant social media use.
The fragmented raps. They work with the apathy of drill. They're throw away gestures. Feeble, incapable of sustaining anything close to proper bars. Vaporous, any structural apparatus completely evaporating. its also cognitively distorting. a mind that keeps going back on itself. where rap used to value flow, now its the aesthetics of interruption and blockage that are prevalent.
I don't thing you here many strings like that in UK drill. again, music's gone all hollywood. its an epic. some samurai epic.