The problem is that the received picture is in black & white and the audio quality is poor.
The strange thing is that this is all used to work fine, but stopped literally overnight without apparent reason. I can only think an electrical storm might have caused power loss and the systems re-booted to different / default configurations or perhaps a Sky software upgrade was automatically installed which has caused problems.
Normal causes such as conflicting wireless don't apply as PC wifi and microwave are at 2.4Ghz and the phones are at 1.8Ghz. We don't use auto door gear and the nearest neighbours are 500 metres away.
Any thoughts and ideas as to how to get a colour picture and normal sound would be much appreciated.