Channels not filling with EPG data

  • Hi Folks,

    I'm having an issue with some channels in that they have been found during a channel scan and they show up in the epg but the OTA grabber is getting no data for them.
    When I view the guide it just shows an empty grey bar and switching to the channel reports no signal.

    The channels I'm having issues with at the minute are the BBC RB 2 and 3 channels.
    RB 0 and 1 work fine, I can switch to and from them with no issues but have noticed that that they are on 770MHz (iirc) and 2 and 3 are on 680 (might have that wrong, don't have the info in front of me)

    Any ideas on how to get these two channels to work? With the olympics being on I'm looking forward to channel hopping between them depending on which sport is on at the time.

    Thanks,

    Art