Sorted!
We all thought that the whole point of the DynaDock with the two video outputs was to allow you to plug in two monitors. We were wrong.
I've realised that you can only use one of the outputs at once (or get two displays the same).
I've now switched off the laptop monitor by setting the <Fn><F4> to projector only, then I have one monitor plugged into the laptop VGA port, and the other from the DynaDock.
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