Hmm, perhaps I wasn't very clear. The duplicated and templated half isnt shaded at all in any of the perspective views - it just appears as a grey wireframe even when I select 'Smooth/Flat shade all'. It's not really that great a deal as it turns out, I've just continued with the tutorial without templating one side. I'd still like to know how its done though, because it would make things a bit easier.