Hello and welcome.
Well, it sound like either your Sky boxes LNB settings may not be correct or your LNB is on its way out.
Why? Well, there is nothing on 12207 H on the UK TV satellites. There are no frequencies close to 12207 on the horizontals - i have just tried 12207 h and get "no signal messages" - the reverse of your problem). So if you are using 12207 H and getting a date and time, but not on 12207 V (which is the Sky news frequency) then that points to an LNB polarisation issue.
YOu can check the LNB settings on the SKy box via services , 0, 0, 1, select. You can, by pressing the red button, reset the LNB settings in the LNB settings page, then green to save.
Or failing that then either your have some short in your cable, or, as you suspect, your LNB is not working correctly and not switching polarities correctly.
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