I made a bit of a #@%&-up with the Surfing with an Alien tut. I got carried away with painting the skin weights and forgot about the blendshapes section. I discovered my oversight and added the blendshapes at the end. This stuffed up the deformation of the head when using the neck control. I did manage to recover as I made a copy of the weights painted body before adding any blandshapes. I just detached the skin, created a new skin and copied the weights from the backup body.

I am sure there must be a way to add blendshapes to a skinned and weight painted mesh. If so, how?