OK Just to reply to all three comments on my post and thank you for your time.
My Systems. and there is nothing wrong with the wiring.
Downstairs is an optical cable going to a sound bar, now before I get told as the virgin call centre told me that they don't work correctly with sound bars. I have had this setup for over seven years and was actually set up by a virgin installer after leaving sky, up to about two months ago it worked perfectly fine even with Dolby and surround sound, then I get an update and it no longer works properly and I have problems of things recording with no sound or I have to change channels to get any sound and on top of that the box has slowed down to a snails pace, even after turning off and powering down. An upgrade should improve not make a system worse.
Upstairs my tivo box is link direct to my tv via HDMI and sometimes when I turn on I have no sound and I have to change the TV over to another AV source and back to get sound. Again I have had it for seven years with no problems until several months ago.
The only common denominator between them both is the Virgin Tivo box. Add that to the problem of speed with my Broadband, maybe time to move on I think.