Well, the clock now lies in a heap, partially abandoned. I don't mind saying it wasn't the most logical way to build a clock, it came in many layers of card so that you had to glue (up to 21!) layers of card together to make one cog! There are about 15 cogs! However, it did give me an idea so I set about making an automaton, after inspiration from this great book:
I decided to do a really simple mechanism based on the Devillish Sweet and Cake Maker, you pull a cord, his mouth opens (you put a sweetie inside) you let go and his mouth closes. After a few minutes of jumping up and down while you wait, you can now open his mouth again and eat the sweet in the firm knowledge that you deserve it!
Below are the original drawing, in progress shots and the final version.
I'm quite happy with the way it turned out, although the photographs aren't great. I need a new camera really. But anyway, it's for sale in my Etsy shop here.