Adduxi - I'd like to address the matter of different ground potential raised by Jon_T.
There's an intresting article about this
here.
Taking this article at face value, the nub of the argument is that different ground potentials arise when there are two different electrical systems. Now consider two adjacent houses on the same phase from a common electricity source. How can they be at different earth potential when they are on the same electrical system?
On Jon_T's point about a fault in one building leading to a path to earth via the ethernet cable going into the other building's Powerline seems a bit esoteric to me. That would have to be an extreme situation whereby in the faulty electrical circuit live remains open because the trip in the consumer unit hadn't occurred.
There is, however, a conflict of common sense.
1/
Common sense says that with modern electrrical standards, why not link two houses on a common electricity supply and phasing? Just do it and hope that speeds will be reasonable.
2/
Common sense also says don't link two electrical systems even if they are common because you don't know what can happen.
What would I do? I'd try it because I can't see what fault in the neighbouring building would do anything different with or without Powerline adaptors which, after all, are just propagating RF and not directly bridging electrical systems. If next door blows and they have no Powerline at all, and surge that might occur will still reach my system.
If they are on different phases, then the Powerline solution won't work anyway because the electrical system isn't common.
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