Huge fire rips through West London Tower block with many of the residents feared dead

A witness describes observing a large fire from a distance while driving. The fire engulfed one side of a building, and emergency services were seen responding to the scene. The witness noted the rapid spread of the fire and the presence of multiple emergency vehicles.

What kind of emergency services did the observer see responding to the fire?

In the observer's opinion, how quickly was the fire spreading?