To test the tuners test as Terrestrial.
Menu > Setup > Service Searching > Select the appropriate tuner > Set to DVB-T/T2 whatever it allows you.
Set Terrestrial Provider to GB Provider for your area.
Run a manual scan. Menu > Setup > Service Searching > Manual Scan > Select appropriate tuner at top. Set 'Type of Scan' to 'Complete'. Set Network Scan to YES.
You could have an issue with your feed.
Regards recording, have you initialised the HDD correctly? Have you checked the mount point? Blue button > VIX > Mount Mananger > Set HDD to /media/hdd