Looking back, I realise that I was thinking of banana plugs - the ones that fit into the back of speaker binding posts.
If we accept that the banana plug option on binding posts is acceptable for audio connections then presumably banana plug patch cables should work O.K.
So this suggests that if I run the audio cables under the floor then I could terminate them in banana plug sockets.
These would be set directly in the floor to give minimal disruption (I hope).
Apart from mounting them in a custom made metal plate screwed to the floor, are there any other mounting methods which spring to mind?
Wall mounting is probably not an option because we have just had the walls replastered.
Skirting board mounting might be an option but I'm not sure there is enough depth, and this also sounds a bit fiddly.
I am assuming at the moment I will run wires directly from the floor sockets to the binding posts on the AV amplifier, although a patch panel at the back of the audio stack is another option.
At some point I might split out the two main speakers and amplify them from a separate audio amp so I can have a stereo set-up independent of the AV amp, in which case patch cables sounds quite attractive.
Anyway, product suggestions welcome :-)