I have no idea what this site has to do with chocolate bars, but hey, made you look.
http://www.aglassandahalffullproductions.com/
According to Fallon UK, this campaign the first step in a gradual shift by Cadbury's from ads to branded entertainment. Thanks Simeon. Enjoy.
Misha Cornes

Fascinating. Even after I read it, I went back to study the image… which is equally as fascinating, not only the image but the response I had to it, and the cyclical process it created. Well done.
It made me want to buy Phil Collins some chocolate.
IMHO, the attempted branding is that the viewer feels as good about watching this as she/he does about eating a Cadbury Milk Chocolate bar, or as good as the gorilla feels about drumming to Phil Collins. It’s like an air guitar.
I feel the love, wether it’s for chocolate, gorillas, Phil Collins, or the drums, it’s definately in the air. I think this gorilla had some Cadbury Milk Chocolate before he went on his solo performance. I want some chocolate now.