I am seeing various reports that there is an issue with the UK guide data in Windows Media Center. Many users are reporting there there is no EPG data in the system beyond October 30th rather that the 14 days Windows Media Center normally supports. I checked my own system and have the same issue, some guide data is being downloaded over the air via DVB-T2. I tried manually forcing a download but there is still no guide data.
It could be related to the end of British Summer Time and the changing of the clocks or there could be some other issue but Media Center’s TV functionally is dependent on EPG data.
There is a ticket created on Microsoft’s connect site and a thread on TGB.TV
UPDATE: The issued has been raised with Microsoft UK