Electrical Tingling Sensation from MacBook Pro Case

I am starting this as a new discussion/thread as all others that are similar seem to be archived now.
We have just bought a superb, MacBook Pro 15" i7. Lovely it is. Works like a dream and much quicker than the MacBook it has replaced. Anyway, the problem...
When this MacBook Pro is connected to either our Samsung Syncmaster BX2431 or our Hitachi 1TB external and NOT getting power from mains then we get this mild, but weird and worrying, tingling sensation from the case. When the MacBook is receiving power from mains then its OK.
Will also add that if MBP is running on battery without these devices attached then its fine and dandy. As soon as one of these is connected then... zing... its not painful or anything, but prolonged use does make it uncomfortable.
The Samsung is connected to mains using a transformer to convert power from AC to DC, but the AC supply uses full 3-pin plug (no dummy earth pin), the external USB also uses a transformer but does have a dummy earth pin.
Monitor: if I connect a different VGA monitor -- that has AC power supplied directly -- then we don't get this tingling.
We purchased at Stormfront. We will take it in but, of course, they've never heard of it... and it does seem to be an old problem (2007, 2008).
Are we alone? Any suggestions?

Hi tjk.
Yes and no. Have tried both. Have tried in same four-gang extension, separate four-gang extensions... no surge protection... and into wall. Have only tried in this room though.
We only get this problem when MBP is NOT connected to main... i.e., when using battery. When we connect to power and charge battery then its all OK... as its earthed (we use the three-pin plug with mains cable, not the travel-adapter thing).

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