That's a good notion. I'll see what I've got that's suitable...
LATER...
My Marantz AV receiver is network-capable (though I've never used that aspect of it) so I connected it to the router. And there it is, in the network listing: I can access its setup menus from my Windows 7 PC.
On the other hand - something else I'd forgotten and only noticed while connecting up the receiver- my Sky HD box was already connected to the router. And the connecton works: I can access all the various on-demand services. However it doesn't show up as part of the network and as far as I know never has - but perhaps it's designed that way? I tried entering the Sky IP address in Windows Explorer and got nothing.
The Marantz's immediate trouble-free connection does suggest that it's the LibreELEC installation which is causing the network no-show.