After some more diagnostics with this, i think the issue has been caused by a recent Microsoft update. Though I have found the original product specs and Windows 7 isn't on the supported operating systems at the time, probably as it had not long been released.
I have uninstalled the Display link software and let Win7 find the Dynadock itself. It has picked up and older version from the laptop, but still does not work. When I configure the DisplayLink software using the icon on the taskbar, putting the display to off, it reverts back to extended after a reboot.
Again, any help gratefully received.
Johnny
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