Again gentlemen, thank you one and all for the additional advice, information and especially clarification about Calman's exact postion regarding the Wacom meter, very much appreciated.
I have decided to forego an OEM Rev-B and have ordered the retail iD3 from Amazon, as liberator72 has pointed out it's a good price. I'll report back on what I actually receive (it may possibly be old stock but looking at the tracking, its being flown in from Germany - hopefully thats a good sign!).
I have the spendid Calman Home for Sony and have calibrated my ZD9 with a rather old (8 years plus I think?) Colormunki Photo spectro. The iD3 will hopefully provide at least a confirmation of my existing calibration if not better it, we'll see.