Thanks for all your prompt replies, help and advice John. Very much appreciated.
Plenty to be getting on with now!
I have 2 virgin TiVo boxes and fibre virgin WiFi, one box is not working when trying to use catch up or on demand it comes up with error 603.
this if the box closest to the WiFi router, other box is working fine, tried resetting both WiFi router and box without any success.
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If you want assistance please start your own thread.