A hammer, nail and 8mm full nut does the trick. Just punch the pins down, split the chain then punch the pins back in. Give it waggle after to make sure there are no stiff links.
I am buying a new Ultegra front mech and guess I'll need to split my chain. Can I buy a quick link of some kind that will work with this chain, or if not where can I buy a new link pin as I can't seem to find any.