Thanks to all for your help. Problem finally solved with the assistance of a very helpful and knowledgeable telephone technician from Sky+.
It turned out that the second Sky Engineer, who sorted out my reception problems, also reset the new Sky+ box to the same (default 55) frequency channel as the original box. I reset the frequency on the SKY+ box to frequency channel 68, which was how it had first arrived, and, lo and behold, RF reception again on channels 5 and 6 on both my TV, and DVDR, when switched over to that via AV. I can also access the separate Sky boxes on AV1 and AV2 on the DVDR. I'm chuffed!
Apart from my lack of knowledge (although I've learned a lot in the last few weeks of frustrating hook-up!), my investigations failed to find the frequency clash, because it is necessary to enter a hidden area, “Installer's Settings” to arrive at "Frequency Channel". The operation is
Press "Services" on the remote control
Press 4- "System Set-up"
Ignore the on-screen menu- Press 01, and then "Select"
This brings you into the “Installer’s Settings” screen
Press 4- “RF Outlets”
Over-write the channel number on "Select Channel" to the new one that you require
Scroll down and press "Save New Settings"
Press "Back-up" until you're out.
Thanks for the assistance.
Tosh.
Last edited by Tosh McCaber; 2nd February 2006 at 08:24.