Not sure about the UK, but the metal case on every VCR I have looked at is connected to "circuit common".
Oops! Sorry, I must have been in too much of a hurry last night and didn't quite say what I was thinking.
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Yes, the case is generally linked to the circuit common here as well. What I meant to say, is that the case has no direct electrical connection to anything
on the AC line side of the transformer, i.e. no equipment grounding conductor in the cord, and no metallic path to either the hot or neutral. High-value resistors connecting the circuit "ground" to the neutral are not normal practice in electronic equipment over here.
The grounded case on modern PCs certainly contributes greatly to RFI suppression, and the ground is also needed for the filters on the the power input to properly attenuate common-mode noise.
NEC article 647 is interesting in relating to a balanced supply. 647.4(D) specifies some quite close tolerances for voltage drop as well.
