Simple, yet conveys the story well!
My favorite part is the color scheme and the London cityscapes, just beautiful.
I wouldn't expect anything less from two of my favorite animators :D

Fun, great and long

Wonderful all the way. The awkward moment at the Food Emporium, the old man who only seeks attention, Chocolate Man's mom returning (and the turtle (YAY!)) the excellently animated sealion(?)'s slowmotion jump and "Someone should call 9-1-FUN!".
Not to say the obvious product placement that was made to be funny and done very good. And return of the mega-X pizza/ice cream dinner!
Yay for ending song.
No, I'm just so sad that it's over. Oh well, I guess I can rewatch a million times more.

Sound: 9/10
Animation: 8/10
Humor: 9/10
Crazyness: A lot of it
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Total: 9/10