An update to a post I made on Jan 29th.
My replacement Netgear Ethernet-over-power (or HomePlug) unit has arrived. As expected, it's an XEPS103 unit - with built-in power supply for a Netgear router like my DG834G. This has the benefit of meaning you can plug the router into a socket, and get it's ethernet connection from the same socket.
The whole process was a bit more painful than I'd hoped, but no more than I'd expected. I ended up phoning A-Novo (Netgear's UK rep. for this recall) three times. The first time, the person who picked up the phone immediately dropped it again, putting me to the back of the queue! I was therefore, not a very happy bunny by the time I got to speak to a real person. At which point I discovered that Netgear had failed to supply A-Novo with sufficient replacement kit to cover the returns they were getting. How helpful. Not only that, but A-Novo were getting (& giving) mixed messages about when they had (or had not) been sent kit, and when they were expecting more.
However, all in all, another week of waiting, and on my third call I was informed that my unit had been shipped. Being as I don't live in London (or anywhere close to it!), I didn't believe the girl on the phone who said I would be receiving it 'today'. I received it two days later, but given my location, that was acceptable. So, now, 48 hours later, my network is still working, and I no longer have long cables trailing around doors, and up stair-wells.
I will have no problem choosing to buy Netgear equipment again in the future.