caller / geographic spoofing and legality...
@jeremy - having a skype number (or other forwarded number) isn't so much spoofing as the number does actually trace back to the original caller - it isn't trying to pretend to originate from someone else.
I suppose it could be called geographic spoofing, but that's a completely different issue.
When it comes to caller ID spoofing, I haven't lived in the UK for a few years now, but do any of the phone companies try to charge for it in addition to the bill? If they do then they should be liable for selling a broken feature. I would have no issue with them having it as a part of the standard line rental but... I would think that charging for this feature without making it exceptionally clear that it can be sidestepped would leave the phone companies open for legal action of some kind.