It's a well made Ad indeed, there is only one but that has nothing to do with the quality of the ad and that is that the ad has absolutely nothing to do with what Cadbury does, I don't come from the UK, so I had to google Cadbury and it looks like they make chocolate??
And it isn't even mentioned in the ad.

Again it has nothing to do with the quality you guys delivered I am just wondering that's all.

This is for instance something that got made here in the Netherlands , this brings the message a lot clearer I think:
https://www.youtube.com/watch?v=SVCHuPzuJpM


I don't know how high up you are in the hierarchy at MPC Hammer, but maybe you guys can do a parody on Willy Wonka and the chocolate factory( somewhere along the line of a drunken Santa kicking around his elves versus the happy santa )

Again lovely work