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@christianSpaceman
Thanks Mike, that's a very helpful post.
The cassette freewheels ok, then as you tighten the QR more and more the pressure on the hub gradually tightens until eventually the cassette will stop freewheeling. It's a bit of an odd one, it seems like the width of the hub is slightly (<1mm) too short so gets all squashed together; yet they've been on another bike previously (I bought them second hand, so I guess it's looking like they were knackered by the previous owner).
A bike shop mechanic reckoned it could be a cracked axle - seemed unlikely but I checked and it's not that.
I imagine something in the freehub must be messing it up; I took a quick look but it looks a little intimidating and I think life is too short to go trawling over a second hand, broken £40 wheel the day before hitting the Alps! Look like a paypal dispute and new wheel might be the easiest way out.
Thanks again for taking the trouble to reply.