Lucid: this is a further development of this thread from me, and it will be the last, as everything is now resolved. I want to thank you again for your invaluable help in advising and recommending what I was enquiring about. I ordered the Yamaha SR-C20A soundbar from Amazon (along with the HDMI cable, and they arrived the next day. It is now set up, and is working just how I would have wanted it to (TV handset controls the volume). Also, it is exactly the same width as the TV set. which was an unexpected bonus. The sound is now much, much better than how it was without the sound-bar (in fact, the TV sound alone, and with the sound-bar, are not even in the same town, let alone the same street). You have saved me a great deal of work and worry (also money), so I can only thank you again, most sincerely.
L.L.
L.L.